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End fed wire antenna length calculator


The VK4YE end fed antenna does need a small counterpoise of 0.05 wavelengths at the lowest operating frequency. The reason is not complicated. You cannot simply connect a generator of.

The theoretical length for the radiating wire can be calculated with my online Harmonic calculator 14.050 MHz = 10,14 m 10,120 MHz = 14,07 m 7.050 MHz = 20,20 m The first section.

To use the calculator, enter the desired operating frequency in megahertz to get a starting length in both feet and meters for building a quarter-wave vertical antenna . You can shorten your.

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Note the 330-foot (100 meter) open reel tape measure ($17 at Harbor Freight). If you build wire antennas, you need one. Looking down the path where the antenna will go. I stretched the wires and the tape measure down the path, and set the center insulator at 65 feet, for a 130-foot dipole. Then clamped the wires here to establish the feed-point.
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YAGI Wifi ANTENNA. A multi-band end fed wire antenna presents a potential problem in that a ¼ wave length antenna cut for say the 80 metre band will present a feed impedance of about 70 ohms however when the same antenna is used on the 40 metre band the feed point impendence will be several thousand ohms and therefore difficult to achieve a.

secure the ends, the 4-Band antennas need at least 60 feet of ground space from end-to-end. The 7-band antennas need at least 120 feet of ground space end-to-end. 8-band antennas need 239 feet of ground space end-to-end. The antenna is completely assembled and no adjustments are necessary, just screw in your coax and raise the antenna as.

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THIS MUST ALSO BE CONSIDERED in the calculations. It forms a part of the antenna electrical length even though it doesn't radiate. If you add the length of the original G5RV to the feeder described and take a velocity factor of roughly 90% into account, the full electrical length from antenna tuner to the end of the antenna is about 27 metres.

This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. There are usually four.

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This resulted in two designs; a 300 Ω and a 200 Ω design. Both had feeding locations much closer to the antenna end than usual. This improved the VWSR-performance quite a bit. In 2006, Tom Rauch, W8JI, reproduced these findings with a slightly longer bare copper wire antenna. However, two problems remained:.

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The VK4YE end fed antenna does need a small counterpoise of 0.05 wavelengths at the lowest operating frequency. The reason is not complicated. You cannot simply connect a generator of.

End fed wire antenna length calculator How does an end fed antenna work. HOME E-mail On this page I will try to describe what I know about End Fed Half Wave antennas. I am always learning so I can see this page change from time to time as I learned more and correct mistakes. I don't expect anyone to take this information as gospel.

It was his site that helped me build my end-fed half wave for 10m, although the design can be modified for any of the HF bands. First you need a half-wave length of wire. Using the formula.

This antenna is usually fed 1/3 from the end, in other words its a 1/3 wire lenght, feed point, followed by 2/3 lenght of wire. The longer the total wire the better. However I do like these antennas, they work almost as good as a mono-band dipole would.

The total overall length of the EFHWA is an electrical half-wavelength, calculated from the formula L (Ft) = 468/F (MHz) where L is the overall wire length in feet and F is the desired operating frequency in Megahertz. This is the length of wire right from the tuner terminal to the insulator at the far end. The formula is approximate, taking.

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Cut one of the wires into two lengths, 34 and 16 feet. Splice the 16-foot wire onto the 50-foot wire. Now you have wires that are approximately a halfwave on 40M (66 feet) and 20M (34 feet). I added spade lugs to one end of each wire. I used pieces of a used gift card to make end insulators that would allow for adjustments if needed.

For CB this means the wire must be a multiple of 11.1m or 36ft 6.5 inches. Therefore, a three wave long wire would be 33.3 m (109 ft 9 inches) and four-wave long wire would be 44.4m or 146ft 3 inches in length. The best wire to use in making a long wire antenna is a hard drawn copper or copper clad wire of around 12 or 14 gauge.

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1. EFHA’s are a special case of “random wireantennas. Keep in mind that an EFHA is a random wire antenna on any band other than the one it was cut for. 2. Other than loops, all antennas are dipoles whether you intend them to be or not. All antennas require some return path for the RF current to the antenna to get back to the transmitter.

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Calculate the overall length of the antenna using the formula: Length = 15000 / center band frequency = Centimetres For example: On 2 metres this gives us 15000/146 = 102.8 cm. Calculate the length of the lower section: Braid = (7500 / center band frequency) x VF = Centimetres Eg. On 2 metres with RG-8x: (7500/146) x .78 = 40.1 cm. To position.

The original Windom antenna from the late 1920s was an off-center fed resonant dipole with a single wire feedline of any length. It was intended to be used on one frequency only. Its main advantage was that it could easily be matched to a tube transmitter. Today's versions, based on the original Windom, include the common OCF and Carolina Windom.

The antenna wire then becomes shorter by the length of the depanding feedline. Now calculate the mechanically lengths of the antenna wire l SM and the length of the two-wire feedline l LM from the electrically lengths taking into account the velocity factors of the antenna wire (here VF S = 0.95) and the feedline (here VF L = 0.80).

The length depends of the frequency: wire length = 5/8 * v * c/f. Where v is the velocity factor of the wire, c the speed of light in vacuum (300.000 km/s), and f the frequency. We can simplify this to: wire length = 187500000 * v / f. The antenna impedance (R+jX) merely depends on the ground plane, but will be rather capacitive (negative X).

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Here we take a look at an End Fed Half Wave antenna which is resonant on many HF bands due to a 49:1 matching unit being used.Antenna Design Plans: http://ww.

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This calculator is designed to give the vertical length (height) of a particular whip type antenna, or the frequency of it. Enter one (only one) value, the desired frequency or the antenna length in any length field. Click on Calculate and the opposite value will be displayed in feet and inches or frequency in megahertz (Mhz).

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2.1. Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz. 1/2 λ dipole (meters) = 142.65 / frequency in Mhz. Full wave loop (feet) = 1005 / frequency in Mhz. Full wave loop (meters) = 306.32 / frequency in Mhz. Cut wire slightly longer for connecting insulators and pruning. 22-Jun-2007 09:30 AM.

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PD9JS - RF Antenna calculators for various antenna types. Radio waves behave very similar to the photons in light waves. The wavelength calculators used to calculate the antenna element.

The folded dipole antenna is an extremely practical wire antenna and is also called an ultra closed spaced array. It consists of two parallel, closely spaced λ/2 dipoles joined together at the outer ends forming a narrow wire loop (d << L and d << λ). The antenna is fed at the center of one dipole, i.e., the dipoles have the same voltage at.

34 to 35 meters - 111 to 115 ft. 26 to 27 meters - 85 to 88 ft. Feedline Lengths: The feedline length is also an important part of a "friendly" antenna design. When calculating optimum lengths, we must use the velocity factor of the feedline. This depends on the spacing of the wires of Ladderline (true Openwire).

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Using'Current'Chokes' Transmi^er'current'travels'on'center'conductor'and'inside'of'the'shield'of'coNaxial'cable'feed'.

Use 49 feet of coax from the antenna to your meter, and 6 feet from your meter to your radio. 49 + 6 = 55. If you find that 49 feet is too short from the antenna, then add 11 feet to the coax from the antenna to the meters, making your total length, with jumper cable, 66 feet. 11 X 6 = 66.

maybe better. Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire. Shorter length counterpoise wires can be used if operation is confined to 40m or higher. Any counterpoise should be at least 1 foot above ground running away from or perpendicular to the antenna wire.

For measurement of the length of the antenna in inches, we need to multiply the factor A with 5900 and then divide it with the frequency of the antenna. For calculating the length of an antenna in feet, we need to multiply the factor A with the digit 492 Indian divide it with the middle value of frequency.

End-fed wire antennas are a different beast. They are not a half-wavelength long, meaning that, if you choose the length of the radiator wisely, the impedance at the end of the wire will not be as high as the impedance of a half wavelength long wire. In many cases, the impedance can be transformed with the help of a 9:1 unun (unbalanced input.

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As an alternative, a wire Lambda ½ long would be most suitable for the lowest operating frequency. When calculating the Lambda ½ length of an end-fed wire antenna at a cable cross section of 1.5 mm² (0.00232 sq in) for the most practical operating frequency in the 80m-band, you will obtain a wire lenght of 41.32m (135.5643 ft).

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This makes the end-fed antenna perfect as a multi-band antenna. Just look at the following example: 20 meter wire is a half wavelength for the 40 meter band, two half wavelengths for the 20 meter band, four half wavelengths for the 10 meter band and 3 half wavelengths for the 15 meter band.

Cut the tape at 35 1/8”. This will be the director of the antenna and will attach to the front of the antenna. Cut two 17 3/4” long pieces of the tape. These will serve as the driven elements. Cut an additional element from the tape. This will need to be 41 3/8”. This is the reflector element.

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A Double Zepp is a center-fed 1/2 wavelength antenna. The double extended Zepp is a dipole type Antenna consisting of two collinear 0.64 wave length elements fed in phase. This double extended version provides 3 db gain over a dipole on the band it is designed for and each side or leg is about 5/8 wavelength long.

out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes with putting up a more elaborate antenna. All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them.

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This antenna is usually fed 1/3 from the end, in other words its a 1/3 wire lenght, feed point, followed by 2/3 lenght of wire. The longer the total wire the better. However I do like these antennas, they work almost as good as a mono-band dipole would.

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As an alternative, a wire Lambda ½ long would be most suitable for the lowest operating frequency. When calculating the Lambda ½ length of an end-fed wire antenna at a cable cross section of 1.5 mm² (0.00232 sq in) for the most practical operating frequency in the 80m-band, you will obtain a wire lenght of 41.32m (135.5643 ft).

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A 1:1 at the rig end does away with the common mode concern in that config. I have used this antenna with a 9:1 unun with a 6'5" counterpoise and it gets a perfect 1:1 match on 20m. How does it match on 80m at that length? 80 to 90% main element length leading away from main element. Yes, it matters.

The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for.

Review of the Packtenna Antenna systems in the November 2016 QST magazine. Installing traps on an antenna allows you to turn your EFHW into a multiband antenna. When you switch bands on your radio, the antenna is automatically set for the band you have chosen. No need to pull the antenna or change elements. As far as traps go, you can buy them.

Low Band Dipole Covers 160-80-40 meters with an overall length of only 100 ft. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. The typical bandwidth is: ... Fully assembled using 12 ga. insulated high-strength solid copper wire, CIN end insulators & 50 ft. nylon support rope.

Our 7-Band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters, with no tuner required! Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. Our 7-Band antennas are OCF (off-center-fed), with a 45 foot leg and a 90 foot leg, totaling 135 feet.

In fact, it looks more like an end-fed 1/4 wave 160 meter antenna (130 ft or 39.624 m long) which goes up some 25 feet (7-8 m), then over horizontally, at an average of 25 feet (7-8 m) above ground, to a tree at the far end of my property.

On a 9:1 end fed, the coax is an integral part of the antenna and radiates about as much as the wire. More coax is good in this case because its more antenna to radiate. If you want an end fed for 160m that actually works well you would go with a full 1/2 wavelength of wire (about 250ft) fed with a transformer that has a very high impedance output to match the 1/2.

* Note about antenna wire selection In what follows I'm referring to stranded, insulated copper wire (for the antenna and counterpoise wires), but if you prefer using solid and/or bare wire, it will be ok too; things will change in case you'll use a different material (e.g. steel) since, due to the velocity factor of the chosen material, the suggested lengths may.

" order_by="sortorder" order_direction="ASC" returns="included" maximum_entity_count="500″] QRPGuys Portable No Tune Half Wave Antenna - $30 Your PayPal receipt is your confirmation that we have received your order. Stock availability and shipping volume can delay shipping. We continue our antenna offerings with this single band, 80m-10m end fed half wave wire antenna.

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To use the calculator, enter the desired operating frequency in megahertz to get a starting length in both feet and meters for building a quarter-wave vertical antenna . You can shorten your.

It is noteworthy in case of a long wire antenna that for lowest frequency of operation the length is generally considered as half wavelength and external feeding is provided at the end. Generally, it is placed in horizontal manner, with respect to ground thus radiates horizontally polarized wave at an angle between 17° to 24° relative to the surface of the earth.

End-Fed Horizontal Wires(EFHW) cover multiple bands with-ou. FULL HF Coverage, no tuner needed on most frequencies. No long counterpoise, radials or feedline required. Rugged weather-resistant 50-Ohm matching network. Fast Setup and takedown. ... MFJ-1984MP, END FED, 1/2 WAVE, 40-10M, 300W, WIRE ANTENNA.

The length depends of the frequency: wire length = 5/8 * v * c/f. Where v is the velocity factor of the wire, c the speed of light in vacuum (300.000 km/s), and f the frequency. We can simplify this to: wire length = 187500000 * v / f. The antenna impedance (R+jX) merely depends on the ground plane, but will be rather capacitive (negative X).

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Oct 3, 2014. #2. Single ended antennas need something to simulate the other half of the antenna. These antennas usually work better if they have an RF ground "plane." In the case of an end fed vertical antenna the RF ground "plane" is a number of radial wires stretched out from the base of the antenna. Since the end fed wire is in the air it.

Dipole Antenna Calculator The measurements below are for building a simple Dipole Antenna. The Wire Size can range from 16 AWG to 12 AWG. The larger the wire, the wider the bandwidth. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. Place a 1:1 Balun on the Antenna end of the Feedline.

The formula for a calculating the length of a full wave loop antenna is: Length (feet) = 1005/f MHz. 544' is comfortably resonant at 1.847kHz, 3.694kHz, ... 544' insulated Flex-Weave Antenna Wire held by 3/16" Dacron Rope. Craig has excellent.

This is an End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. It is a resonant Half wave on 80m (3.5MHz) therefore also resonant on second, ... Wire length ~130 feet; Power Handling: 1kW I.C.A.S;.

The wavelength calculators used to calculate the antenna element dimensions will therefore use the speed of light (299792458 meters per second) in a vacuum as constant. Note: when using coax for antenna elements it is advised you lookup and apply the velocity factor because RF slows down in coax and this will impact the effective measurements.

The EFHW-8010-2K End-Fed Halfwave 2kW Multiband Antenna with mounting kit by Myantennas.com. This is due to the wire end impedance of a 1/2λ dipole being close to 2450Ω, which is the feed point impedance of an EFHW (ie at the secondary of the impedance matching transformer). So by using OHM’s law V = √ (P x R), if we feed the antenna with.

Item Details: The advantage of an EFHW is the ease of construction, it’s versatility in a variety of installation configurations (sloping, horizontal, L, etc.), no tuner is needed, and this one works on 4 bands: 10, 15, 20, and 40 meters. We chose a 250-watt rated antenna so you can comfortably transmit the full... View More. Tel: 1-860-594-0200.

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Above is a plot of the common mode current vs distance from the feed point with 1W input. The first 10m is the vertical pair, and the next 20m is the horizontal wire. The current at the left end of the horizontal wire is 0.026A, which for 1W implies Req=1480Ω, and the action of the differential current is to offer a quite low feed point.

The length of the antenna wire should be between 24 and 60 feet for best performance. Additional counterpoise is not normally required, as the coax shield provides the counterpoise function. Wires longer than 60 feet may have excessive impedance for some tuners to properly match. Wires shorter than 24 feet may not radiate as effectively. A 30 foot.

A so-called random wire antenna is an end fed antenna. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. ... Feeling a bit too lazy to calculate that by hand, however, I wrote a program or two to do all the dirty work. ... (QST, Oct 1926, "The Length of the Hertz.

For a suspended counterpoise wire, the "ideal" length would be 1/4 wavelength. That would provide the lowest impedance on the common side of the feed point and send the greatest amount of power into the antenna and minimize any RF on the outside of the coax shield. Because the feed impedance on an end-fed 1/2.

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The average power at the antenna: In watts The antenna gain in dBi: Enter 2.2 for dipoles; add 2.2 ... No computer program can accurately predict where wiring or reflective objects may create hot spots in your particular installation. This is a World Wide Web front end for a public domain program written by W4/VP9KF using PHP.

Build instructions 1:49 impedance transformer for end fed antennas. Including enclosure, Ferrite toroid (FT140-43), winding wire, stainless steel ... 5 meters of wire is a half wave for a 10 meter band. 10 meters of wire is a half wave length for the 20 meter band and two times a half wave length for the 10 meter band. 20 meters of.

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lower end of the slant wire. Figure 9; 90 Degree Tower Slant Wire Fed Example Like the 60 degree example, this antenna has a quite acceptable circularity, + 0.6 dB, and a vertical pattern which is virtually identical to a base-fed antenna of the same height, except for a.

A MULTI-BAND END FED HALF WAVE (EFHW) ... A random length of wire (~41′ is a good length for 20/30/40m on my KX1) will present a range of impedances depending on the frequency. ... so I can plug in the antenna wire for 1:16, 1:25, 1:36, 1:49 or 1:64 impedance transformation.

Model 4130 - QRP 4:1 Unun 1.5 - 54 MHz - 300 watts. MSRP: Now: $54.95. Was: Designed for use with end fed wire antennas and multiband verticals, this unun is small, compact and perfect for quick portable/emergency installations. This 4:1 Unun (200-50 ohms) will easily handle 300 watts and covers 1.5 - 54 MHz.

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The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired.

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This resulted in two designs; a 300 Ω and a 200 Ω design. Both had feeding locations much closer to the antenna end than usual. This improved the VWSR-performance quite a bit. In 2006, Tom Rauch, W8JI, reproduced these findings with a slightly longer bare copper wire antenna. However, two problems remained:.

Calculator. https://m0ukd.com/homebrew/baluns-and-ununs/end-fed-half-wave-antenna-tuned-coupler-efhw/ https://k7mem.com/Ant_Element_Lengths.html.

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This makes the end-fed antenna perfect as a multi-band antenna. Just look at the following example: 20 meter wire is a half wavelength for the 40 meter band, two half wavelengths for the 20 meter band, four half wavelengths for the 10 meter band and 3 half wavelengths for the 15 meter band.

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To use the calculator, enter the desired operating frequency in megahertz to get a starting length in both feet and meters for building a quarter-wave vertical antenna . Frequency in MHz: Length of the vertical element: -. -. You can shorten your vertical antenna by using a loading coil.

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The antenna needs to resonate. The 17cm length is approximately 1/4 of the wave length of the frequency in use. The antenna should be cut for the frequency being used. If a 1/4 wave whip is not sufficient, then you can add a ground plane. The ground plane would be a few wires at right angles to the whip and 20% longer.

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Calculate the overall length of the antenna using the formula: Length = 15000 / center band frequency = Centimetres For example: On 2 metres this gives us 15000/146 = 102.8 cm. Calculate the length of the lower section: Braid = (7500 / center band frequency) x VF = Centimetres Eg. On 2 metres with RG-8x: (7500/146) x .78 = 40.1 cm. To position.

The antenna wire was sloped upward to a surplus halyard that brought it to about 25 feet about 3⁄ 4 of the way along its length. The remainder of the wire came down to about 8 feet above ground with the end insulator secured to a handy tree. The coax to the entrance facility passed through a lightning arrestor and then via about 50 feet.

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The antenna length formulas used in our dipole length calculator are as follows: L = 468 / f. l = L / 2. Where: L - the length of the total dipole antenna in feet (ft); l - the length of the arm of the dipole antenna in feet (ft); and. f - the desired frequency. We also used the simple wavelength formula:.

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End Fed Half Wave 40-10 Wire Antenna The solution to improving my send and receive would be making an End Fed Half Wave (EFHW) 10-40 antenna. I want to optimize based on a few things: small lot, low-vertical leeway, nosie neighbors and avoiding the power lines in the backyard, I thought that an EFHW 10-40 wire antenna is the best solution..

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The End Fed Half Wave antenna or the popularly known EFHW antenna has been around almost ever since the inception of HF radio. Nevertheless, the EFHW antenna had in the past, been rather sparingly used by amateur radio operators due to various reasons. ... For instance, in the case of a typical 80m-10m coverage EFHW antenna, the length of the.

1. Step 2. Put the coax connector into the hole and use a marker to mark the four holes for the screws (see 2A and 2B). Drill the four fastening holes with a 9/64 inch bit. Next to where the coax connector will be installed, drill a 13/64 inch hole for the counterpoise connection. 2A. 2B. Step 3.

End-fed half-wave (EFHW) antennas provide a convenient way to move the coaxial feedpoint for a half-wave antenna from the center to one end. There are three types of antenna feeds in popular use: 1) transformer feed, 2) L-matching network feed, and 3) Zepp. The transformer feed variety may be broadband and, depending upon its construction may.

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The antenna length formulas used in our dipole length calculator are as follows: L = 468 / f. l = L / 2. Where: L - the length of the total dipole antenna in feet (ft); l - the length of the arm of the dipole antenna in feet (ft); and. f - the desired frequency. We also used the simple wavelength formula:.

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Thus, to get the practical length of the antenna wire, the value multiplied by a factor K to the basic length of the antenna wire, i.e., (4) The value of K depends on the thickness of the conductor and the operating frequency. This value of K is accurate for antenna wire at a frequency of up to 30 MHz.

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THIS MUST ALSO BE CONSIDERED in the calculations. It forms a part of the antenna electrical length even though it doesn't radiate. If you add the length of the original G5RV to the feeder described and take a velocity factor of roughly 90% into account, the full electrical length from antenna tuner to the end of the antenna is about 27 metres.

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Note the 330-foot (100 meter) open reel tape measure ($17 at Harbor Freight). If you build wire antennas, you need one. Looking down the path where the antenna will go. I stretched the wires and the tape measure down the path, and set the center insulator at 65 feet, for a 130-foot dipole. Then clamped the wires here to establish the feed-point.
YAGI Wifi ANTENNA. A multi-band end fed wire antenna presents a potential problem in that a ¼ wave length antenna cut for say the 80 metre band will present a feed impedance of about 70 ohms however when the same antenna is used on the 40 metre band the feed point impendence will be several thousand ohms and therefore difficult to achieve a ...
secure the ends, the 4-Band antennas need at least 60 feet of ground space from end-to-end. The 7-band antennas need at least 120 feet of ground space end-to-end. 8-band antennas need 239 feet of ground space end-to-end. The antenna is completely assembled and no adjustments are necessary, just screw in your coax and raise the antenna as
THIS MUST ALSO BE CONSIDERED in the calculations. It forms a part of the antenna electrical length even though it doesn't radiate. If you add the length of the original G5RV to the feeder described and take a velocity factor of roughly 90% into account, the full electrical length from antenna tuner to the end of the antenna is about 27 metres.
This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. There are usually four
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This resulted in two designs; a 300 Ω and a 200 Ω design. Both had feeding locations much closer to the antenna end than usual. This improved the VWSR-performance quite a bit. In 2006, Tom Rauch, W8JI, reproduced these findings with a slightly longer bare copper wire antenna. However, two problems remained:
The VK4YE end fed antenna does need a small counterpoise of 0.05 wavelengths at the lowest operating frequency. The reason is not complicated. You cannot simply connect a generator of
End fed wire antenna length calculator How does an end fed antenna work. HOME E-mail On this page I will try to describe what I know about End Fed Half Wave antennas. I am always learning so I can see this page change from time to time as I learned more and correct mistakes. I don't expect anyone to take this information as gospel.
It was his site that helped me build my end-fed half wave for 10m, although the design can be modified for any of the HF bands. First you need a half-wave length of wire. Using the formula
This antenna is usually fed 1/3 from the end, in other words its a 1/3 wire lenght, feed point, followed by 2/3 lenght of wire. The longer the total wire the better. However I do like these antennas, they work almost as good as a mono-band dipole would.