I use a wireless handheld and headset (both UHF) in each of my racks. No problems with the handheld normally as it is usually away from my system however, the Countryman E6 headset is another story.
The feedback from this one, even in the super-cardioid configuration was a problem so I put a Sabine Sl-820 feedback eliminator in line with it ..... problem resolved!
DJSlatz
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