I have two (2) G50 Wireless Relay units used for guitar and bass in my live band. I constantly experience drop out issues even while standing within two feet of the receiver which is mounted on my peddle board. While using wireless dongles for our lighting, the drop outs got so bad, that we had to use wired setups. We move around a lot so that was a huge bummer to have to stand in one spot.
I know the dongles are in the same 2.4 ghz frequency range but is it that narrow of a band that there are not any usable frequencies??