I am surprised that you're getting clean reception with all the antennas buried in the box like that.
Yeah, that's another topic. My preferences would be these:
1. Mount the antennas in the wings and run
coax to the receivers.
2. At least move the antennas out of the box with short pieces of
coax and keep them near the box, but a half-wavelength apart, as measured from center
stage.
3. Replace those sixteen stubby antennas with two log-periodic directionals and (if necessary) a signal pre-amp to drive all eight receivers with a lot less hardware.
4. Get the actors to do their jobs and raise their voices like actors were doing for centuries before we started spending a thousand dollars a pop on these things. (Maybe this one is actually higher than Number Four on my list of preferences, but one must be realistic.)
I'm pretty good with radio, less so on electronics in general, and know very little about handling
electric power. But, I'm about all the "engineer" this company has and they are slowly developing some faith in my recommendations. With any luck, they'll let me do something from the list above, but that's going to have to wait for another day. In the meantime, I'm kind of anxious about all those plugs...