There are several synonyms for the phrase "going on the air" that are commonly used in the broadcasting industry. "Taking to the air" is a popular phrase that refers to beginning a live broadcast. "Going live" or "going live on the air" are other terms that are frequently heard, especially in the context of news programming. "Starting a broadcast" is a more general synonym that can be used to refer to any kind of broadcasting, whether it be radio or television. Finally, "beginning a transmission" is another term that can be used, particularly in reference to radio signals.