Communication using radio waves in the 30-300 MHz band to transmit information. Because the ultrashort wave has a wavelength between 1 and 10 meters, it is also called meter wave communication. The bandwidth of the entire ultrashort wave is 270 MHz, which is 10 times the width of the shortwave band. Due to the wide frequency band, it is widely used in the transmission of TV, FM broadcast, radar, navigation, mobile communications and other services.

Ultra-short wave is very different from short wave in transmission characteristics. Due to the high frequency, the emitted sky wave will generally penetrate the ionosphere and shoot toward space, but cannot be reflected back to the ground by the ionosphere, so it mainly relies on direct wave propagation in space (only limited diffraction ability). Like light, the propagation distance is not only limited by the line of sight, but also by the mountains and tall buildings. If a TV tower with a height of several hundred meters is erected, the maximum service radius can only reach 150 kilometers. If you want to spread further, you must rely on the interrupt station to forward.

Ultrashort wave has a shorter wavelength. Therefore, the size of the transceiver antenna can be small. In short-distance communication, only small communication equipment is needed, so it is widely used in mobile communication. Since the 1980s, combined with telephone exchange technology, mobile stations can form a two-way communication circuit with other mobile stations through a telephone exchange by dialing, called a wireless phone (or mobile phone), and can communicate with the local telephone network to form a convenient Flexible communication network. The smallest mobile station is handheld and weighs less than 1,000 grams. Reporters carry them into the scene for interviews, and can keep in touch with the editorial department at any time within tens of kilometers. If there is a device for text fax, image fax or manuscript writing with a portable computer, the manuscript or photo interviewed can be sent back to the editorial department on the spot.