We have 14 SLX4 receivers in our rack here, and every show I've done we have had problems with the mics dropping signal. It doesn't matter which channel I use. I thought that since the wavelength of the carrier is about the same as the width of the rack rails it might be that the rack is shielding the antennas. Would it help to use a non-conductive rack? If I can't do that, can I put the antennas remotely and use passive signal splitters (i.e. from Radioshack) to distribute the RF to each receiver?