Not really any problem with outside unit but we normally use a DVD or usb drive there. I have used radio some but only local stuff.
My coach is a 2015 35UN with all Jensen equipment and I just happen to have the cabinets out today as we are installing a lot of audio equipment tomorrow and Tuesday. I went out to check after reading your question and Jayco has selected a dipole antenna for this radio. Looks like a single white wire running along floor is all that radio has for antenna. Like I said, mine seems to work pretty good though.
Nothing wrong with a dipole antenna, I use one for FM on my home theater that has 12 thousand bucks in sound equipment. Yep, movie night is a treat around my place!
I can't hear the inside radio on the road and it sounds very, very cheap when parked. I knew this when I bought the rig and planned tomorrow's adventure then. By the time we finish this install YOU will hear my inside as I travel!!