Plain English Meaning

The radio system pilots use to talk to controllers and other aircraft. Because the signals travel in straight lines, you need to be high enough that nothing solid (like the curve of the Earth or a mountain) sits between your aircraft and the station you are talking to.

Full Definition

Two-way voice radio transmissions in the Very High Frequency band, specifically the 118.000–136.975 MHz range allocated for civil aviation air-to-ground and air-to-air communication. VHF signals travel in essentially straight lines (line-of-sight), so range depends on aircraft altitude and the height of the ground station's antenna.

Context Anchor

Seen on a stack or , where selects a before making or receiving radio calls.