Is it possible to have an installer run the Sat signal over the same line as Cable? Reason...I have a Tivo that I use for viewing movies stored on an External Hard Drive that is connected to my computer. All done wirelessly. If I can keep Cabletv...at lifeline cable (bare minnimum) It'll make it easier to justify keeping the Tivo hooked up. Or, is it possible to stream movies to the HD DVR Directv offers?