I was driving down the freeway once and all the sudden heard this smashing noise on the roof that sounded like somebody was up there with a baseball bat trying to smash through the roof. It was loud enough to scare the heck out of me and I immediately pulled over to the side of the road. It turned out to be the metal radio antenna that a screw had come loose and it was laying sideways a few inches off the roof and the wind was causing it to buffet and hit the roof. I couldn't believe how loud it was able to sound inside the motorhome because I would not have guessed for a second that's what it was.