1) By placing a field strength meter in your control room tuned to your station frequency am or fm or both your can watch the preformance of your transmitter.
1a ) It can tell you if your antenna got a bad or loose connection when your meter jumps up and down ! ( when wind is blowing strong or hard rain fall normal and side rain )
1b) Keeps an eye out on your transmitter output range ( to make sure your getting out )!
Note : After you have drove around to see what your range was,( set the meter if need be ), then mark the meter and the dial setting with the milage and it will let you know when you lost your range ! ( replace transmitter when need be )
2) Always have a back up transmitter and test and run it once in awhile on a dummy load with meter to make sure its good !