A good antenna usually does more for your results than a more expensive radio, and it is often the cheapest part of the station. The trouble is that the choice is bewildering. Every design has fans, and every fan is convinced theirs is the answer. This guide compares the four common first choices (dipoles, verticals, end-fed wires and loops) so you can match one to your lot instead of to an argument on a forum.
Start with your lot, not the catalogue
Before you look at any product, go outside with a tape measure. Note the longest clear run you have, how high you can safely get a support, and where the nearest power lines and buildings are. Then note the constraints that are not physical: a landlord, a homeowners' association, a municipal by-law or a family who would rather not see wire across the garden. The best first antenna is the one you can actually put up and leave up.
Know your licence and the rules
Listening on HF needs no special preparation, but transmitting requires the right licence and following the rules of your country. Canada and the USA differ in which HF bands and modes each class of licence can use, so check your national regulator's current rules before you choose bands. This matters for antenna choice, because there is little point buying a multiband antenna for bands you cannot yet use. If you are still studying, the exam practice questions are a free way to keep going while you plan.
The half-wave dipole: the honest benchmark
A dipole is two equal lengths of wire fed in the middle. It is simple, cheap and forgiving, and it is the antenna other designs are usually compared against. A half-wave dipole for 40 metres is roughly 20 metres (about 66 feet) end to end. It presents close to a 50 to 75 ohm load at a reasonable height, so it can be fed directly with 50 ohm coax on its design band.
The trade-off is length. Lower bands need a lot of wire, and a dipole is a single-band antenna unless you add extra wires, traps or a tuner and different feedline. Height matters too. A dipole strung low tends to send more of its signal upward, which is useful for regional contacts on the lower bands but less so for distant ones. If you only have one tall support, an inverted V is a common answer, as long as the ends stay well out of reach, because the wire ends carry high RF voltage.
Verticals: small footprint, radials required
A vertical is the natural choice for a small lot, since it needs only a little floor space. It radiates equally in all directions around it, so you never have to aim it. Vertical polarization tends to favour lower takeoff angles, which can suit long-distance work. The catch is that a quarter-wave vertical is only half an antenna. The other half is the ground system, so it needs radials, either a good number laid on or in the ground or a few elevated ones. Skimping on radials wastes power as heat in the soil. Verticals also tend to pick up more man-made noise, which matters if you spend a lot of time listening.
End-fed wires: quick to deploy, with caveats
An end-fed half-wave with a matching transformer is popular for portable and stealth use because it needs just one feedpoint at the end of the wire, and it can work on several harmonically related bands. A random-length wire with a tuner and matching unit is even simpler. These antennas are easy to hang from a tree or pole, but they have no built-in balance. The outside of the coax, or a counterpoise wire, becomes part of the antenna. That invites common-mode current, RF in the shack and noise. A choke on the coax near the feedpoint and a sensible counterpoise help a lot. Matching transformers also lose some power, so buy from a maker who describes its design honestly, or build one carefully.
Loops: quiet and compact, or big and simple
The word "loop" covers two very different things. A full-wave wire loop is a closed length of wire, roughly a full wavelength around, hung as a square, triangle or other shape. It can perform well and is often quiet on receive, but on 40 metres it needs well over 40 metres of wire. A small magnetic loop is only a fraction of a wavelength across, so it fits on a balcony or table. It has a very narrow bandwidth, so you retune it whenever you move a modest distance in frequency. It is usually the most expensive of the four. It also develops high voltage on the tuning capacitor and strong local fields, so keep people and pets well away while transmitting.
Feedline, chokes and tuners
Whatever you choose, treat the feedline as part of the antenna. Use 50 ohm coax of a quality suited to the length and the bands, because loss rises with frequency and with length. Keep runs no longer than needed. Add a common-mode choke, which is a few turns of coax on a suitable ferrite core, near the antenna end. An antenna tuner matches your radio to the load it sees. It does not make the antenna radiate better. A tuner at the radio also cannot remove loss in a mismatched coax run, so it works best with an antenna already close to resonance. The ham radio quick reference is handy for keeping band edges and modes straight while you plan lengths.
Safety comes before performance
- Stay well clear of power lines. Choose supports and wire routes so that nothing can fall on or blow into a line.
- Keep transmitting antennas out of reach of people and pets, and keep the power appropriate for your setup. Both countries publish RF exposure guidance, so read it.
- Do not climb without proper equipment, and do not work overhead alone.
- In storm season, disconnect and ground your feedline outside the house, or unplug it, when the antenna is not in use.
Common mistakes
- Buying a multiband antenna before checking which bands your licence allows.
- Installing a vertical with too few radials and blaming the design.
- Running long lengths of thin, lossy coax on the higher bands.
- Skipping the choke on an end-fed and then chasing RF in the shack.
- Putting the antenna low and close to metal roofs, gutters or house wiring.
- Expecting a tuner to fix a poor antenna.
A quick checklist to decide
- Long clear run and one or two supports: start with a dipole.
- Small yard and no supports: choose a vertical and plan the radials.
- Portable, temporary or hard to see: an end-fed wire with a choke.
- Noise-sensitive listening or tiny space: consider a loop, and accept the cost or tuning.
- Check your bands with the live HF propagation page so the antenna favours the bands that are actually open.
Second-hand gear can be a good buy. The ham radio marketplace lists antennas and accessories, and a local club is a good place to see designs in person. You can find one through find a club. If you enjoy a simple project, building your own 10-meter antenna is a friendly place to start.
Wrap-up
There is no single best HF antenna, only the best one for your space, your licence and your patience. A dipole is the dependable benchmark, a vertical rescues small lots, an end-fed wire wins on speed and portability, and a loop rewards those who value quiet reception or have little room. Start simple, put it as high and clear as safely possible, and improve it once you know what you want. Then log what you work. Your first antenna will teach you more than any guide can.
How HamRadioList can help
Once your antenna is up, check the live HF propagation page to see which bands are worth trying, and record every contact in the free online logbook. If you are still working toward your licence, the exam practice pages are a good way to prepare while you plan your wire.
- Live HF propagation - see current band conditions before you call CQ.
- Free online ham radio logbook - log every contact, import and export ADIF, sync with QRZ.com and keep your awards organised.
- Ham radio quick reference - bands, modes, phonetics and Q-codes on one page.
- Ham radio marketplace - buy and sell radios, antennas and accessories.
- Find a club - locate a local amateur radio club.
New here, or getting back on the air? Create your free HamRadioList account to log contacts, check band conditions and practise for your exam, or browse more guides from the blog. HamRadioList is built by amateur radio operators in Nova Scotia for operators everywhere.