Which frequency band has line-of-sight capability and is primarily used for short-range air-to-air and air-to-ground communications?

Which frequency band has line-of-sight capability and is primarily used for short-range air-to-air and air-to-ground communications?

• A. UHF
• B. VHF
• C. HF
• D. SHF

Answer: (B)

VHF supports line-of-sight communication, which is ideal for short-range air-to-air and air-to-ground voice links. It operates in the aviation voice range (about 118 to 137 MHz), giving clear, reliable exchanges between aircraft and controllers or between aircraft themselves within the typical flight range. Because signals in this band travel primarily in straight lines and don’t reflect off the ionosphere, their reach is limited to the horizon, matching the needs of short-range operations. HF, by contrast, relies on ionospheric reflection for long-range reach rather than line-of-sight, so it isn’t used for routine short-range air communications. SHF is geared toward radar and high-speed data links rather than standard voice comms, and while UHF is also line-of-sight and used in military communications, the standard choice for typical short-range air-to-air and air-to-ground voice is the VHF band.

VHF supports line-of-sight communication, which is ideal for short-range air-to-air and air-to-ground voice links. It operates in the aviation voice range (about 118 to 137 MHz), giving clear, reliable exchanges between aircraft and controllers or between aircraft themselves within the typical flight range. Because signals in this band travel primarily in straight lines and don’t reflect off the ionosphere, their reach is limited to the horizon, matching the needs of short-range operations. HF, by contrast, relies on ionospheric reflection for long-range reach rather than line-of-sight, so it isn’t used for routine short-range air communications. SHF is geared toward radar and high-speed data links rather than standard voice comms, and while UHF is also line-of-sight and used in military communications, the standard choice for typical short-range air-to-air and air-to-ground voice is the VHF band.