When I started flying in 1983 we used AM channels and we tried using different channels but during big events pilots had to impound transmitter.

It’s always a good idea when flying around other pilots is talk about radio or FPV interference because it’s real and can cause a crash.
If there’s any planes or helicopters flying around I’d highly suggest talking to them about equipment before powering up.
A few minutes can save some equipment and keep others safe.