What an antenna does
An antenna converts electrical energy from your transmitter into radio waves, and does the reverse when you receive. Most ham antennas are built around one idea: a piece of conductor whose length is related to the wavelength of the signal. When the length is right, the antenna is said to be resonant, and it accepts power from the feedline efficiently.
Because amateur bands span a very wide range, from long HF wavelengths to short UHF ones, no single design is best everywhere. The sections below group the common types by how they work and where they tend to be used.
Dipoles
The half-wave dipole is the classic starting point. It is a wire split in the center, with the feedline connected at the gap and each side about a quarter wavelength long. Dipoles are simple, cheap and forgiving. They are usually strung horizontally between supports, or in an “inverted V” shape with the center high and the ends sloping down.
Strengths: easy to build, predictable, no radials needed. Limitations: a single dipole is resonant on one band (though multiband versions using traps, fan elements or an antenna tuner exist), and it needs room for the full span, which is long on the lower HF bands. You can find build details in our article on ham radio antenna designs you can build at home.
Verticals and ground planes
A vertical antenna is typically a quarter-wave radiator over a ground system, often a set of radials. It radiates in all horizontal directions, which is handy for general coverage, and its low-angle radiation is often favored for long-distance contacts. Verticals take up little horizontal space, but their performance depends heavily on the ground system underneath them.
On VHF and UHF, the same idea shrinks to a small whip or ground plane that is easy to mount on a roof or a vehicle. Most FM voice operation on 2 meters and 70 cm uses vertical polarization, so a vertical antenna matches what other stations and repeaters use.
End-fed wire antennas
End-fed antennas connect the feedline at or near one end of a wire rather than at the center. Popular versions include the end-fed half-wave (EFHW), which uses a matching transformer at the feed point, and the long wire. They are lightweight and quick to deploy, which is why portable operators like them. The tradeoffs are that they rely on a good matching unit and often some form of common-mode choke to keep RF off the coax.
Yagi and quad beams
A Yagi-Uda beam has a driven element plus a reflector and one or more directors. It focuses energy in one direction, giving gain over a dipole and reduced pickup from the sides and rear. Quads use square or diamond loops of wire in a similar arrangement. Beams are common for HF DX, for 6 meters, and for satellite and weak-signal work on VHF and UHF.
The cost is size, weight, and the need for a mast and usually a rotator. A beam only helps when it is pointed in the right direction.
Loop antennas
Loops come in several forms. Full-wave loops are wire loops fed at one point and can perform well on a single band. Small magnetic loops are compact, tuned with a variable capacitor, and often used where space is very limited. Small loops have narrow bandwidth, so they need retuning when you change frequency, and they can be sensitive to construction quality.
VHF/UHF and handheld antennas
Handheld radios usually come with a flexible “rubber duck,” which is convenient but compromised. Many operators improve results by moving to an external antenna such as a J-pole, a collinear vertical or a mobile whip. A dual-band whip is common for cars. Height matters a lot on these bands; see our note on the height of a VHF radio antenna for why.
Choosing by band and space
| Situation | Often considered |
|---|---|
| Small lot, HF | End-fed wire, vertical, or small loop |
| Room for wire, HF | Dipole or inverted V |
| Chasing distant stations | Beam or well-built vertical |
| Local FM and repeaters | Vertical J-pole or ground plane |
| Portable or field use | End-fed wire or telescopic vertical |
Neighborhood rules, local regulations or an HOA may also shape your choice. If you plan to build, check any local height and structure rules first.
Feedlines and baluns
An antenna is only half of the system. Coaxial cable carries power to it, and loss increases with frequency and length. A balun or choke may be needed where a balanced antenna such as a dipole meets unbalanced coax. See our ham radio coax guide and the coax cable loss chart for more.
Common questions
What are the different types of HF antennas? Common choices are dipoles, inverted Vs, verticals, end-fed wires, loops, and beams such as Yagis and quads.
What is an antenna? It is the element that couples your radio to the air, turning electrical signals into radio waves and back again.
Can I use my CB antenna? Sometimes, on a nearby band; see can you use a CB antenna for ham radio.
For the fundamentals behind these designs, read ham radio and antenna basics.