From Wiktionary, the free dictionary
From air + wave.
airwave (plural airwaves)
- singular of airwaves; thus often "radio" or "frequency".
2008 December 23, Richard Sandomir, “On Old Cassette, Barber's Voice Brings to Life Game He Missed”, in The New York Times[1]:Vander Meer’s no-hitter at Ebbets Field on June 15 was a witness-only event, unheard on any airwave.