1. not broadcasting.

The radio station went off the air at midnight.

2. not being broadcast.

Many people were angry when they heard the program was off the air.

• have a free hand
• have a frog in throat
• have a frog in your throat
• have a good head on shoulders
• have a good head on your shoulders
• have a good mind
• have a good mind to do something
• have a good pair of lungs
• have a good run
• have a good run for money
• have a good run for your money
• have a good thing going
• have a grip on
• have a grip on something
• have a hand in
• have a hand in doing something
• have a hand in something
• have a hard time
• have a hard time doing something
• have a hard time of it
• have a head for
• have a head for something
• have a head start
• Have a heart!
• have a heart