on the air
Definition from Wiktionary, the free dictionary
Alternative forms 
Prepositional phrase 
- In the process of recording or broadcasting; a radio station that is transmitting a program; or a particular source of modulation, such as a specific microphone, that is connected.
- In a few minutes, we'll be on the air giving a live broadcast.
- Being broadcast.
- The popular television series was on the air for ten years before it finally ended.
- (in the process of recording or broadcasting): on air
- (being broadcast):
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- Federal Standard 1037C