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

Messages can be transmitted using microwave (as well as radio waves); television uses ultra-short waves and microwaves for signal transmission; navigation primarily uses medium waves for signal transmission. Long waves and medium waves are used for...

The height of a short-wave radio tower depends on factors such as wavelength (frequency), ground conductance coefficient, and transmission distance; for radio towers used for ultra-short waves and microwaves, the height is taken...

Dependent on the transmission distance. The transmission distance for 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 according to the following formula (kilometers). In the formula, HT represents the height of the transmitting antenna; HR represents the height of the receiving antenna.

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