TV Antenna no longer works

I would first check all of the connectors on the coax cable. RV manufacturers normally use "screw on" connectors. Go thru and rescrew the connectors or take them off and have someone install crimp-on professional connectors. You would need to check on the powersupply for the antenna and also up top on the antenna itself for the connectors. These things will back off or even fall off in travel just like anything else that is screw together and not secured. Not a good solution for this application. Also a break in the center pin of the coax is not unusual if it has been kinked somewhere in the run to the roof. Even if everything has worked for years, all it takes is a little bit of the right vibration and it could severe a weak spot. Check continuity on the center conductor and also on the ouside sheathing. If either one lacks continutiy then you need to find the break or run a new cable.