Salesdawg I'm not gonna read all these posts to see if someone already answered this ! Read a couple that weren't even close so i'm assuming the rest may not have answered your question. Here's my version. That Diplexer won't pass the 22Khz tone for the HD stuff! The best way for trouble free is the run a line option. There are short cuts depending on your configuration by using power splitters but the cost and hassle aren't worth it! Run the line!
This is CABL.com posting #273538. Tiny Link: cabl.co/mbjj4