I am NOT tech savvy, but need help. I just upgraded my regular DVR receiver to an HD DVR receiver w/directv (Just purchased a HDTV). The installer told me I had to have two lines to use this new receiver. I don't understand this as I already have one HD DVR receiver in another room. He installed it anyways (it would be very tedious to try to run a new line through my townhouse!) with the understanding that there is no "second line". Why is this necessary and can I use some kind of coaxial splitter to hook into my receiver box? There is only one coaxial line coming out of the wall and there is a satellite 1 and satellite 2 input on the back of the receiver. I don't care about the feature of being able to record a program and watch another at the same time. Can you help??