Miking a theater stage - how can you be sure that all the actors will be heard?

Miking a theater stage - how can you be sure that all the actors will be heard?
Sound reinforcement for theater can be a tricky problem. Sometimes the actors are heard, sometimes they are not. Sometimes it sounds a little strange...
Source: www.record-producer.com

Why does a wireless microphone receiver have more than one antenna?
If you work with wireless microphones, then you are working with possibly the most problematic pieces of audio equipment. What must you do to make sure you don't get the blame when the wireless mic goes wrong?
Source: www.record-producer.com