Our church is an old church that is built out of wood, steel, brick, and granite. No 2 walls are the same height. This seems to be an issue with wireless mic signal!! We have high end audio technica mics and their antenna distrobution system with paddle antennas and still did not have enough signal. There were signal drop outs left and right. I just installed these and now I can get all the way across the parking lot!!!! Love them, always loved Shure....would recommend to anyone. Sweetwater is fantastic. I ordered Friday around noon for a saturday delivery and got them at 11am Sat. Perfect service!