Had the same issue a few months back. Pulled both RFX-150's and installed one RFX-250 and have never been back. The basic package I use is an MRF-300 w/RFX-250. I posted this problem here when it was happening and Eric Johnson replied with a wiring idea on the CAT5 for the second RFX-150 (Do a search). Tried it - worked a little better - but the RFX-250 was the fix. Anybody need any RFX-150 antennas, have a ton of them.