Plain English Meaning
A station on the ground that pilots talk to over the radio. It might be a control tower, a Flight Service Station, or a remote antenna site that links pilots back to one of those facilities.
Full Definition
A ground-based station equipped to transmit and receive voice or data between pilots and air traffic services, including ATC facilities, Flight Service Stations, and remote communication outlets that extend their coverage.
Context Anchor
Seen in instrument flying discussions, charts, procedures, and where must what provides radio communication for the .