In my TT the FM antenna connects to the TV antenna. It is directional and is best when raised and pointed at the station. The AM antenna is non-existent. There is no antenna plugged into the port on the back of the Radio/DVD player.
The trailer was used but I do not see any signs of the spring loaded whip that usually is mounted on the roof or side of the TT. I do not think there ever was one.
I could of course add one but we have never used the AM radio and mostly use the unit to watch DVDs so there is my much incentive to do so.