When I used a VHF system, I quite often used to get other users on my frequency, a lot of taxi firms as well, believe it or not, so had to go back to a lead on those occasions.
The great digital tv switch over was all about selling analogue frequencies to mobile phone operators for 4G. This has made most wireless musical equipment that also used those frequencies obsolete overnight, however, if it was me, I'd just use it anyway. You're unlikely to be arrested or even noticed, but you might get the odd mobile call out of your amp sometime in the future.