Placing the rfx antenna all but eliminates all interference. I've said it on this forum probably a 100 times. Place it correctly and no issues.

The mx-5000 is not a good remote. Yes it can do some two way and ip control, but it's battery is limited to 4-5 hours, it lacks number buttons, it does lag. If it works for you and you can live with some of its shortcomings, than that is fine. If comparing to a rf remote and you claim it is more reliable, than you simply have not setup the rf properly. I've been working with urc for over 10 years without any rf issues.