I have a CTARM-4 in my system and it works very well.
I have all of my video sources located at the home theater. I feed 2 satellite systems, the DVD and a VCR into the CTARM-4 which has a coax output going to the primary distribution point for my house wiring.
At the primary distribution point, I combine this feed with the local cable feed that goes throughout the rest of the house. Two things are critical if you are going to do this. One make sure that you use a good RG6 coax with perfect connections. It took me a couple tries before I was able to get a perfect picture throughout the house. Second, if you are going to combine the signals with your local cable feed like I did you must pick channel numbers that do not conflict with your cable company. Although my cable stations stop in the 90's, for some reason I was only able to find a few channels above this number where I was able to transmit a solid signal.
Hope this helps. If you have any questions, let me know.