Hello- I have searched the forums and I apologize if a similar question has already been answered. On to my question: I have a dual LNB dish with 2 coax lines running from the attic, down 2 stories and into the basement where my terk 3x4 multiswitch is. The previous homeowner did not run a line for a roof antenna. It would be very difficult to run another coax strand to the multiswitch. I was wondering if I could take one of the existing coax lines and use a diplexer to feed the antenna input on the multiswitch. My thought was that I could put another diplexer in the basement to split the antenna back off and then connect it to the antenna terminal on the multiswitch. Will this work? Thank you.