Tv ariel help please

Houghta

My motorhome has an external ariel connection point linked to the ariel point in the lounge, I recently had an ariel fitted to the roof and the company who fitted it have disconnected the external ariel from the lounge and connected the roof ariel
to it instead I want to have the option of switching between both obviously when a hook up has a booster point use that otherwise use the roof ariel, is it possible to set it up to do this

cheers