Your camper should have a booster built in. Where you attach the coax cable for the television antenna, there should be a little button you push. Normally, a little green light will light up. That is your booster.
If you have Key TV, it's built into the Key TV system. I've never used Key TV or have it, so no experience with it. But from all I've read and understand, Key TV has a booster also. I suppose you have to do something to turn the booster on also.
I do know, with mine, when the booster is off, virtually nothing comes it (at home). But push that button we we get 80 channels in my drive way, same as the house. Amazing, we'll get.... for example, stations 26-1, 26-2, 26-3 and then continuing to flip through the stations we'll get a second set of 26-1, 26-2, 26-3 stations and the programming would be different. It took a while to figure it out that the television was pulling in stations from two totally different stations from 2 different locations, but both used channel 26. (This is an example only). If I turn the booster off, I may get the local channel 8-1 only.
I replaced the Razzar antenna on the roof of my camper. It's not suppose to be "directional" but it is. I replaced with a Wingard 360 and that sucker is awesome. No more turning the antenna, and this is one reason why I'm pulling in repeat station numbers, but they are different networks completely.
I do live in an awesome area for over the air television watching. I took the time to list all the stations on a spreadsheet and have been working (off and on) trying to figure out where they are all coming from. Most I've identfied the locations thanks to this app:
https://www.antennasdirect.com/transmitter-locator.html (Antenna's Direct)
When it comes up, punch in the zip code at your location and it will bring up all the stations located around you.
Don't know your zip code (especially when traveling), then use
https://www.whatismyzip.com/ (What's my zip code)
If you use "What's my zip code" and "Antenna's Direct" on your cell phone, it will work marvelous, provided you have "location allowed" active on your phone.
I uses these two apps all the time when traveling.
Hey, have fun with your television viewing! If you don't ever find a factory installed booster on your camper, then at least you've got something working good for you know.
What make, model, year is your camper? Providing that will really help in assisting finding future resolves for you.