Hi. I have a MX-450 remote and MRF-350 base station (with the 250 external antenna). All my components are in a closet. The MX-450 remote controls all my components through RF to the MRF-350 base station. I can control every component anywhere in my house, however I can only control my Comcast Motorolla cable box from approx 20' from the closet.

Why does the MX-450/MRF-350 work from anywhere for all my components, but I am limited to 20' with the Comcast box? It doesn't make sense...