Here is what I did,
Purchased this
https://www.walmart.com/ip/Eagle-Asp...lexer/24808633
1.Connect the coax with the red tape to the in/out port of the diplexor.
2.Put a coax jumper from the TV port of the diplexor to where the coax with red tape was connected to your antennae booster.
3.Connect another jumper to your satellite receiver.
Your receiver sends power to your satellite dish. The satellite port of the diplexor lets that happen. A simple coax splitter does not. This set up lets you use the same input on the side of your motorhome for either satellite or cable.
From what I have read if you connect a jumper to the in/out of a second diplexor to your motorhome input and your satellite dish to the sat input and campground cable to the tv input you can use both through your motorhome coax run. You would have to select the correct input on your tv.
I hope this makes sense to you. It has worked for me so far.