Basically like a Dish two tuner unit? Haven't heard of such a beast. I suppose you could hook the coaxial output into a splitter and then use some IR to UHF transmitter pyramids to send the signal from the different rooms to the room with the Comcast box. Wouldn't be able to watch independent programming on each tv. The other option is just to forego digital cable in the other rooms and pick up what you can off analog cable.