Whenever I work with an act that uses a Samson Airline Microphone, I always know at some point it’s going to give them some trouble. I know tons of performers swear by these microphones, however I’m not convinced. Usually there’s interference or the just plain drop out during the show.
Part of the problem could be that it has a very limited number of channels it can use. If there’s already things on the three frequencies it can use or other things trying to use them, that may be the problem.
It could be that the people who swear by these mics work in small venues that don’t have a lot of other radio frequencies going around. They may work perfectly at a school, but take it out to a busy fairground where there’s a lot more trying to use radio frequencies and from what I’ve seen, you’ll have trouble.
I use a Sennheiser mic pack and it has tons of channels it can scan. Sure it’s more expensive, but it’s never let me down (except for operator error).