Satellite TV (Direct-TV or Dish-TV) will not work from your satellite dish or Tailgater to the receiver if it passes through the power booster, even if the power booster is turned off. It has to be a direct dedicated connection from the antenna to the receiver. Three different campers, and they were all the same.
The last travel trailer I had had a separate jack to connect the coax from the antenna to the camper. Then another wire from the jack inside the camper to the receiver. Then the wires from the receiver to the television. Newer receivers don't use coax to the television any more, it seems, and the RCA connections (Red, White, Yellow) cable jacks are non-existent. What they are using is the fiber optic cable, which cannot run through your existing coax in your camper.
We did exactly the same thing that you did, run the wire from the "antenna", we had a Tailgater directly to the receiver through a window. Even that dedicated jack stopped the signal between antenna an the receiver box. I ended up figuring out a way to run the wire through the hole where my electric plug wire pushes into the camper.
Eventually, we quit using DishTV and DirectTV completely. We are OK with Over-the-air television and streaming via our cell phones Hot Spot.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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