Thank you for your responses.

So, just to be sure here. I am currently not extending the antenna with Cat5. I'm just using the supplied cable that came with it. Is it just a matter of unplugging the cable (from the antenna end) and popping it into the RFX-250?

The existing cable is fished through the cabinetry and if it is not necessary, I wouldn't want to go through the hassle (although minimal) of passing a new cable through.

Oh, by the way. Will the range be improved (comparable to the older remote)? Or does the narrow band RF just have shorter range?