Just to add to this...
The HDMI output from the front satellite receiver (in the cabinet under the main tv, above the fireplace in our 44b) goes to the input of the splitter in the basement.
The outputs of that splitter go back to the main tv, to the front tv, and the outside tv and the bedroom TV.
If you want Roku all over and don't use the satellite, plug the Roku into the HDMI sat output wire near the main tv.
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