I reread this posting and there are some new things that I might throw in. One is that your parts list shows HD tv, so the question of digital is not likely to be a problem, but it does mean it is new enough to require going into a menu and sorting out how to set it to receive over the air, cable or satellite, HDMI, etc!
So you have a couple different things to sort. One is getting the antenna switch found and turned on. For that, I'm not finding info to tell us WHERE the switch might be as there are tons of different arrangements, depending on what options your specific RV has.
This link should take you to a full group of drawings of what connections to expect but it takes looking at what you have like outside Tv and such but maybe it can help you find out how many connections, slitters, etc. to expect. First step is knowing there should be something, second is FINDING it!
https://www.winnebago.com/Files/File...ire_110138.pdf
A second info item on that drawing set is the color code of the different coax, so that if and when you find one, looking at the drawing gives you colors along the coax lines to let you sort that one with a specific color like green should go to some specific point.
See the colored bands, red and blue in the picture above? Those are good info once you find the code! Blue will go to the antenna and red will go to the cable input!!
Wish you well on finding the small things that bother us the most!!