Are we aware that professional radio stations have backup transmitters?
They are prepared for the event that the main transmitter may break down, and the spare tranmsmitter lets them get back on the air within seconds.
In some cases the backup transmitter is located alongside the main.
Just as often the backup is located at another building or tower somewhere nearby.
Here at KDX Worldround Radio we expect to have backups for all our stations. Over 20 transmitters!