Fixed!
The coax tool was invaluable but alas, the TV had to come down. It was actually quite easy to remove, 3 screws top and bottom; the special bit for their screws makes all the difference.
Since I am not the original owner I can only hope Newmar didn't release it like this, the splitter behind the TV was not connected to the TV, instead there was a coax connected to it (TV) coming from behind the wall.
I removed the coax from the TV and put it in one of the splitter's outputs, the other output I connected to the TV, the input came from a wall plate marked Roof Mount. It now see the antennae and pulls in channels when I scan.
It's great feeling when you figure this stuff out.
