I have the same setup , MX-450 and MRF-260, and I am at a loss. I have tried everything I can think of. Sorry, I've been a lurker for a long time ( normally someone already has found a solution) but help would be appreciated. The IR is fine but the RF is terrible. No interference on "0" but RF is very inconsistent.
Have tried blaster, emmiters and direct input and it's all the same. Highly sporadic. It seems to work better the closer I get but, it should be good from 50' feet at worst. I'm talking 10 feet. If I was reading interferrence I could understand but. the sniffer is clean. The base seems to receive the signal but the IR translation seems to be inconsistent.