Fans of the film Spinal Tap recall the aborted Air Force base concert when air traffic control commands started blurting out of their amps. If you’ve played long enough, at some point you gigged in a place where hotel security walkie-talkies or a local radio station shared your amp’s frequency, which then broadcast through your amp, often in mid-song. It’s enough for anybody to say, “No way!” to a wireless system. However, today’s wireless sets are pretty bomb-proof as long as you factor in variable operating frequencies, range and power options that work best for you. Playing Free Bird takes on new meaning with a wireless transmitter/receiver set.