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Ultra high frequency (UHF) refers to the band of electromagnetic radiation with a radio frequency range between 300 MHz and 3 GHz (3000 MHz). This band is also known as the decimeter band, with a wavelength ranging from 1 m to 1 dm. The UHF radiations are least affected by environmental factors, that is why they are most commonly used for TV and radio transmission and channel broadcasting. They have strong directivity, but, at the same time, the receiving error increases.
Ultra high frequency is widely used for data transmission owing to its short wavelength and high frequency. Since the size of a reception antenna is directly proportional to the size of the waves, the antennas for UHF are short and stout. The higher the frequency band is, the less conspicuous the antenna size would be. The broadcast range (also called line of sight) of UHF is shorter than that of VHF, that is why boosters are used after a few hundred kilometers. UHF is used by cordless and two-way navigation, wireless local area networks, and communication, radio and security systems. UHF radars are said to be effective at tracking stealth fighters but not stealth bombers.