I have an RF20 and powerblaster that controls a Comcast DVR upstairs. I have a second Comcast DVR downstairs that I use for TVs in my den, outside deck and man cave. In the past I used a ir transmitter to work all my downstairs stuff but it sometimes interferes with upstairs (and vice-versa). I had a second RF20 and was told I could stop the interference by purchasing an "addressable" base for downstairs. Long story short (or not so short) is I came across a used MRF-260 and tried to set it up today. My problem is I don't know how to make my downstairs remote and base in sync so the upstairs isn't affected. Ideas please...