Can anyone assist me with a diplexor question? I have a Dish Network 500 with a built in Quad switch. I had a splice at the line going down the wall in my attic. I removed the coupler and installed a diplexer at that joint along with an antenna. I then split it again with a diplexor at the outlet and connected one to Sat receiver and the other to my Antenna input. The Antenna works great and I get all the local HD channels fine. But I have completely lost my signal to the Satellite. Any Ideas.