Today I should be getting the ACT CR234. I am not sure it will be the answer to all my woes, but I have high hopes ...
The ACT will not help the RF Remote's range problem, but it will push the X10 powerline signal throughout your home, eliminating phase coupling problems and greatly reducing any problems cause by "noise". problems.
As a test, wrap about five to eight turns of an 18 inch length of flexible wire around the antenna on the CM15A and see if your range improves... I bet it will. This forum contains information for bettering the RF receive range of the CM15A in many ways. A couple of the mods (like the wire wrap) will not void the warranty since the Cm15A is not opened.