It seems like it would work, but I could see the following problems:
- To pass a TV and Dish legacy signal, the splitter would have to be at least 50MHz - 1600MHz.
- To pass a TV and Dish DishPro signal, the splitter would have to be at least 50MHz - 2150MHz.
- You would have to make sure the TV connected directly to the splitter did not back feed any signals.
Basically, I would eliminate that splitter, or put it before the diplexor.
Should I put in a power pass splitter?