VK3YE amateur radio pages

Return to VK3YE antenna projects, mobile and portable

Portable HF wire antennas to try

Here is a selection of portable HF wire antennas that I've had good results with. None are avery complex and all can be erected at a portable site in a few minutes. Videos below describe and demonstrate them in action. Gather the following main items to start experimenting:

* At least one lightweight portable mast, such as a telescoping squid pole. 9 metres is a good all-round length. 5 metres poles are small and light while 12 metre poles are more robust. More at Various antenna masts demonstrated.

* Velcro strap to allow the mast to be securely tied to a fence or gate. And/or a sand spike.

* Lots of light insulated wire. Can be thin stranded plastic covered type for temporary portable use. A 100 metre reel is good.

* Pieces of chopping board to make antenna insulators.

* An antenna coupler. L-matches are good for end-fed or coax fed antennas while balanced types are good for balanced feedline antennas. Ideas at Antenna couplers galore.

Some of these items can be ordered online with examples presented below.

 

Link dipole

It's easy to make a half wave dipole but hard to make a portable antenna that's appreciably better than one. A dipole's main limitation (if fed with coax) is that it (generally) only works on a single band. To easily overcome this you can make a link dipole. This is a half wave dipole with the element split so that you can lower the centre and change bands by clipping and unclipping part of the antenna. You get no-compromise dipole performance on all design bands. It works well for casual portable operation provided you don't need to change bands instantly.

A 40/30/20 metre link dipole has the following approximate dimension of wire:

---3m---o--2m--o-----5m-----O-----5m-----o--2m--o---3m---

O is the dipole centre

o is a gap which is bridged with an alligator clip for a lower frequency band.
For 20m both clips are open.
For 30m the two inner clips are closed.
For 40m all clips are closed.

You may need to change the dimensions slightly. To do so start with optimising the length of the inner portion (for 14 MHz) with the clips for the other sections open. Then optimise for 10 MHz, with the inner two clips closed circuit. Finally optimise for 7 MHz with all clips bridged.

The video below doesn't show the antenna much but it does demonstrate its performance during the SSB section of the ARRL DX Contest.

 

Tuned feeder dipole

This is a half wave dipole for 7 MHz (ie 10 m wire either side of the feedline) but fed with ladder feedline. In conjunction with a balanced antenna coupler like that described it allows efficient operation on HF frequencies from 5 MHz to 28 MHz. Open wire feedline and the larger coupler adds weight but unlike the link dipole above you get faster band switching from the transceiver end by adjusting the coupler.

 

End-fed half wavelength wire

An end-fed half wavelength wire and small coupler is my default portable antenna if I just want to take the minimum. Wire length isn't that critical (approximately 22m radiating element plus a small counterpoise of 2 or 3 metres) for coverage of most HF bands 7 MHz and up with a small coupler. I typically support it on a telescoping 9m pole and configure the wire so it looks like an inverted-vee (with the transceiver near one end). Here's a video of a typical outing.

 

Triband end-fed wire antenna

Here's a smaller version of the end-fed half wavelength wire antenna ideal for tight spots. It uses a loading coil to reduce length by about 40%. Also offered is the convenience of switching between popular bands without twiddling an antenna coupler.

 

A vertical dipole on 14 MHz

A vertical coax fed dipole can be all you need if operation on a single band only is required. If over or near salt water it's a great no-frills DX antenna. Videos show DX being worked from Australia.

 

14 MHz half wavelength wire vertical (10m long)

A half wavelength wire vertical can be coiled up small, with a 9 metre telescoping pole taking up the most room. Other items needed include a sand spike and an L-match antenna coupler. The videos shows it being used on a beach or pier. It's a half wavelength on 14 MHz but the antenna coupler allows operation on other bands without needing to trim the antenna wire. Of course it then ceases to be a half wavelength on these other bands; on 7 MHz it's a 1/4 wavelength, 10 MHz 1/3 wavelength, 18 MHz a 5/8 wavelength and 21 MHz a 3/4 wavelength.

 

14 & 18 MHz vertical with tuned counterpoise

Radials can be a pain. Especially in public places where people and dogs can trip over them. Something that I've found works well is a tuned counterpoise. More in the video below.

 

Using a sand spike (for a 21 MHz on the beach vertical)

Simple is often best and this 21 MHz vertical is no exception. Installed right on the sand it's achieved great results. The only problem is how to support it with no trees or fences around. The solution is a sand spike. Either buy one or make your own. It needn't go very deep if you're just using a lightweight pole and wire vertical antenna.

 

Vertically polarised delta loop for 20 metres

If you want good performance on a single band and are near salt water it's hard to go past a vertically polarised single element delta loop. These videos show what's involved. And as you'll hear a delta loop can give results some choose not to believe!

 

Half square antennas

Another great low-angle salt water DX performer is the half square. It's a very simple gain antenna. You just need a wavelength of wire, bent into a shallow inverted U, and two support poles a bit taller than a quarter wavelength each. The videos demonstrate versions for 30 and 20 metres.

 

Operating with a vertical Moxon

A Moxon is basically a small two element beam with the outer portions of the elements bent in towards themselves. This is a particular benefit for vertical antennas as the support poles do not need to be as tall. A Moxon takes longer to erect than some of the simpler antennas described. You may need to use two masts. Because elements are critically coupled careful adjustment may be required for best performance. Nevertheless they can give good performance and are a popular choice amongst space-saving DXers.

 

A bisquare for 28 MHz

Even though it's for 28 MHz it's still a monster. The bi-square looks like a quad loop except instead of one wavelength of wire it's two wavelengths circumference. The other difference is that it's open at the top so is not a true loop. This video demonstrates portable operation with it supported by a 9 metre telescoping pole.

 

'Any old bit of metal'

Sometimes you're desperate to get on air. You leave that all-important antenna wire at home. Or you feel like doing things the 'hard way'. In the spirit of improvisation I walk along my local beach to see what can be loaded up as an antenna (with varying results).

 

Kite-supported wire antennas

A kite is the best way to get your wire up really high and get a 'big gun' signal on lower bands like 160 metres. Read all about it at Experiences with kite-supported wire antennas.

 

5 metre long wire antenna for 7 - 50 MHz pedestrian mobile

All wire antennas described above have been for portable operating. But wire antennas can also be used on the move if supported by a pole. A wire length of 5 metres forms a quarter wavelength on 14 MHz and a half wavelength on 28 MHz. A centre loading coil can make it tolerably good on 7 MHz. These and other bands can be covered with a wire of this length with a small antenna coupler. For further details see Wadetenna for pedestrian mobile HF.

 

Making sense of it all

If you've got down this far you'll see there's numerous possibilities for wire antennas. Key choices include (i) single or multi band, (ii) local or DX bias in performance and (iii) tolerable weight and size if carrying.

Below is a quick guide listing popular wire antennas and their pros and cons. It's over-simplified and may not apply for all circumstances. For instance while vertical antennas are favoured for DX they are also the antenna of choice for local groundwave coverage on bands like 160 metres. Sometimes the same antenna can be listed twice, depending on the operating frequency. For example a wire vertical 10 metres long is a half wavelength on 14 MHz but only a quarter wavelength on 7 MHz. Also radiation patterns can vary with antennas used on multiple bands and results in some directions may be appreciably worse or better than a reference dipole.

Comparison of various wire antennas

 

Further information

The following favourably reviewed books have even more portable wire antennas to try.

 

Disclosure: I receive a small commission from items purchased through links on this site.
Items were chosen for likely usefulness and a satisfaction rating of 4/5 or better.

 

Books by VK3YE

 

All material on this site
(c) Peter Parker VK3YE 1997 - 2017.

Material may not be reproduced
without permission.