Switched from hand signals to radios on crane jobs and it cut my setup time in half

Sun in the rigger's eyes is a classic recipe for disaster. Hand signals work great until you're basically playing charades with a blindfolded guy. Radios are definitely the way to go once you get past the initial "wait, did he say left or right?" confusion. I remember my first week with them I kept keying the mic by accident while yelling at a coworker about lunch. Setup time dropping by half sounds about right though, no more walking over to clarify if that was two fingers or three. Have you found any weird issues with interference on your site?