I had a 508 upstairs and when my EA antenna was installed it was no good. I have a 722 and a 612 downstairs where my HD tvs are located. I would like to put my 722 upstairs n use the SD with my SD tv and use the HD downstairs. How can I do this without having to run A HDMI cable to the downstairs? This would be impossible. Is there some kind of HDMI splitter I coul buy or any other device. Might not be possible. Thanks .