You didn't mention the year of your RV unit... I am not familiar with an antenna panel that has a toggle selector switch...
My 2008 setup has one of these WINEGARD ANTENNA WALL PANELs...
Both Cable and OTA antennas are hooked up and to switch from one to the other you press the small push button switch. When the LED light is ON then the OTA antenna is selected and the CABLE TV connection is muted. The LED light ON also tells you that 12VDC is being sent up to your OTA ANTENNA PRE-AMPLIFIER (BOOST AMPLIFIER) that is located in the base of the OTA antenna This panel does not have a toggle switch like yours have...
This is how my setup is layed out...
this is how the back of my ANTENNA WALL PANEL is wired...
The SET 2 in this pictorial is the BEDROOM TV hookup...
I know this doesn't show your setup but maybe this will help you troubleshoot what you have knowing what the process might look like...
"It's frustrating not to get simple radio" This OTA Antenna panel has nothing to do with your AM/FM RADIO reception. You should have a separate spring loaded WHIP TYPE antenna on your roof for the AM/FM radio setup you have...
My OTA TV Antenna looks like this when cranked up...
My AM/FM Radio antenna looks like this one...
Roy Ken