TwistedMelon...just an FYI, you're claiming you have no RF interference on your 2 RFX-250s. How would you know this? First of all, 2 antennae in that small of a space is absolutely not necessary and may be contributing to the problem. Second, you can't test for RF interference with an MSC-400. Just because you don't see the LED lit up while not pressing a button doesn't mean there is no RF interference. You need to get an MRF-350 base station and test on channel zero. There's no way to do this with an MSC-400.

I suspect many of your issues are RF interference related. We have several dozen MX-980/MSC-400 combinations in the field and have had only one case where we couldn't solve the interference and cross talk between rooms...the solution was to use a mix of 418 and 433 product. And in no cases have we needed more than one antenna for a space that small.