Primarily used in communication, broadcasting, television, radar, navigation, and remote telemetry. Communication and broadcasting mainly utilize long wave, medium wave, and short wave (communication waves).

Letters can also transmit signals via microwave; televisions use ultra-short waves and microwaves for signal transmission; navigation primarily uses medium waves for signal transmission. Used for long waves, medium waves

The height of radio towers for short waves depends on factors such as wavelength (frequency), ground conductivity, and propagation distance; for ultra-short waves and microwaves, the height of radio towers is taken

Dependent on the transmission distance. The transmission distance of ultra-short waves and microwaves is equal to the distance along the tangent of the ground surface from the transmitting antenna to the receiving antenna. For relatively

Flat or slightly undulating terrain; the transmission distance can be calculated using the following formula (kilometers): where HT is the height of the transmitting antenna; HR is the height of the receiving antenna.

Height (meters). A relay tower must be set up in the middle when the actual distance exceeds the propagation distance calculated by the formula.