A tower structure and a truss structure for transmitting or receiving radio waves, used as a radiator for a radio transmitting antenna or a support for transmitting and receiving antennas. Mainly used in communication, broadcasting, television, radar, navigation, telemetry and remote control. Communication and broadcasting mainly use long wave, medium wave, short wave (communication can also use microwave) to transmit signals; TV uses ultrashort wave and microwave to transmit signals; navigation mainly uses medium wave to transmit signals.
The height of the radio tower used for long-wave, medium-wave and short-wave depends on factors such as wavelength (frequency), grounding coefficient, and propagation distance; the height of the radio tower used for ultrashort waves and microwaves depends on the propagation distance. The propagation distance of the ultrashort wave and the microwave is equal to the tangential line of the transmitting antenna along the ground surface up to the distance between the receiving antennas. For flat or slightly hilly terrain, the propagation distance can be calculated as follows: HT is the height of the transmitting antenna; HR is the height of the receiving antenna (m). When the actual distance is greater than the propagation distance obtained by the above formula, a relay tower needs to be provided in the middle.
