Chris, thanks! Pretty sure my antenna is the infamous batwing. I asked the the RV dealer repair shop if they could just seal it up. They said the antenna cannot be repaired ( it was working) and adding sealing to it won't work. I really don't understand that, but I asked them twice about this. I don't even care if it's so sealed that I can't use the antenna. I just want to stop any water intrusion that might occur. Why should that be so complicated?
I'll again ask them and include your suggestion of a quad O ring
