Thanks for the suggestion, Tbonz. I was thinking of something along the same lines. I think I might just get some lap sealant and put a little blob on the roof where the antenna hits. That way the movement of the antenna could ware on that instead of the roof membrane.
I guess I was hoping someone with the same model trailer could comment as to weather their unit's TV antenna was installed the same way or not.
It just seems like a really strange way to mount it.