Tuning the antenna.

All antennas should be tuned for the frequencies they are to be used on. This includes antennas used for receivers.
The main reasons for tuning the antenna are:
1. The antenna will only perform at its best if it is correctly tuned.
2. Incorrect tuning can cause damage to a transmitter output.
3. Transmitting on a poorly tuned antenna may cause interference to TV, radio, etc.

Antennas for receivers usually come pre-tuned but this is not the case with CB antennas.
Tuning a CB antenna is usually just a matter of adjusting the length for the lowest SWR reading.

Next page: SWR meters.