We've had a camper that did not come with a TV and one that did. If you have to supply your own TV, you'll probably need a very short piece of coax - a couple of feet- to connect your TV to the connection that's inside the camper, as well as the 15- or 20-foot length that others have described for connecting to the outside of the camper. Also you want to leave the antenna booster OFF when watching TV on cable.
2013 Surveyor SP220
2010 Silverado LT 5.3 V8
The world is a great book, of which those who never stir from home
read only a page. - St. Augustine