I have a second room wired with just one coaxial and it would be almost impossible to run a second coaxial. I would like to order a 2nd HR-20 with the understanding I can't record/watch two different HD programs. The HR-20 would be to feed a Sony 1080p projector to watch HD programming. With only one inbound coaxial and a phone line, is that all I need to use with a HR-20 or do I have to settle for just a HD receiver due to the one coaxial line situation? Thank you.