Which UHF frequency range is designated for Line of Sight (LOS) communications?

The UHF frequency range designated for Line of Sight (LOS) communications is 225 to 511.999 MHz. This range is particularly conducive to LOS communication due to the higher frequencies utilized, which allow for effective transmission over shorter distances without the interference commonly associated with lower frequencies. At these UHF frequencies, signals can travel directly from the transmitting antenna to the receiving antenna, making them ideal for both military and civilian communication systems where reliable and clear transmission is needed.

Other ranges in the options provided, such as 30 to 90 MHz, 2 to 29.999 MHz, and 90 to 224.999 MHz, are generally utilized for different types of communications and may not provide the same level of reliability and clarity for LOS transmissions as the specified UHF range.