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Very high frequency (VHF) refers to the radio frequency electromagnetic waves ranging from 30 to 300 MHz with corresponding wavelengths ranging from 1 m to tens of meters. VHF is widely used for FM broadcasting, television broadcasting, military and local mobile radio transmissions, traffic control long communications, radars, radio modems, as well as in marine and air navigation systems.
Very high frequency is ranged such that it is most suitable for short-distance terrestrial communication with usually a distance of a few hundred miles. VHF is little affected by electrical equipment interference and atmospheric noise. Owing to the fact that VHF waves are not hindered by the presence of buildings and can be received indoors, they are widely used for FM transmission and television broadcasting. These waves do get blocked by hills and mountains so signal boosters are used for broadcasting in such areas. Frequencies below 70 MHz are affected by the ionosphere layer of the earth’s atmosphere. In the case of television broadcasting, channels and sub-bands present in the VHF portion of the radio spectrum are allotted by the International Telecommunication Union (ITU).
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