Radio antennas are mainly divided into two types: source antennas and passive antennas.

There are electronic components inside the active antenna for amplifying the signal, and it needs a power supply to work.

Passive antennas can work without power supply, but the effect is theoretically inferior to active antennas.

Passive antennas are divided into omnidirectional antennas and directional antennas. For example, the outdoor antennas of medium wave and short wave are omnidirectional antennas, which have no directivity, and directional antennas are usually used to receive FM bands, such as Yagi antennas, which need to be aligned with the direction of the radio station. , with obvious directionality.

Active antennas are also divided into omnidirectional and directional. According to the adjustment direction during work, there are manual adjustment and electric or automatic adjustment.

There are also antennas inside the radio, such as ferrite antennas, which are commonly referred to as magnetic rods or magnetic antennas. It can also be divided into indoor and outdoor, according to the shape: vertical antenna, inverted L antenna, T-shaped antenna, umbrella antenna, whip antenna, symmetrical antenna, cage antenna, folded antenna, fishbone antenna...... …