Haven't had any dropouts running on 5 GHz yet, or none that I've noticed. Probably will get more crowded as time goes on though. The school's wireless network is pretty pathetic, connections dropping all the time, even with repeaters in most of the hallways on every floor.
It's a good bet they aren't running dual band. I think a good connection there depends on the weather, sunspots, full moon, incantations and the occasional spirit god. Any request for change regarding a dedicated frequency for audio will most likely fall on deaf ears.
Having an option of a wired Ethernet connection is looking good, or just set your desk up at front stage and roam the room with the tablet when needed. There's always the option of breaking out that 100' trip hazard snake once again.
Oh, WK I wanted to ask you if the Airport Extreme Router would help to eliminate drop-outs in the 5GHz range if that band gets too crowded?