Owners manuals here:
https://www.winnebago.com/
Lots of info online to help but not always as complete as we might like?
Interactive parts drawings to find where things hideAnd what to call them:
https://catalog3d.winnebagoind.com/menu/Parts.htm
But for TV coax, etc wiring this may help:
https://www.winnebago.com/Files/File...e29ve_wire.htm
Bottom of the list are two to check as they have a standard way and mark coax with tape on the ends to match the drawings info.
TV diagrams for what cable should go where and example of color coding.
Click this snip for better view!
Then the install drawings are more physical layout type stuff and may be better for locating what you see in the RV.
Kind of need to look for what you have and find the diagram which matches, like one or two TV, inside, outside, etc.
Then if you can't find something like a splitter, you may be able to go to the parts drawings and search it out on those?
Not a good audio video guy so not much help on the HOW of connecting a new one!
Best of luck and welcome to the group!