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 (communication) waves.

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

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

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 shorter...

Flat or slightly undulating terrain; the transmission distance can be calculated using the following formula (in kilometers). In the formula, HT represents the height of the transmitting antenna, and HR represents 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 above formula.