I went back and watched @OffRoaderX video here talking about his favorite HTs and one was the UV-9G with the Smiley slim duck (same thing I’m running). I noticed in the video that his radio had the same gap at the base I’m seeing on mine. Randy, if you see this and can chime in on your experience with using the radio in this configuration out in the elements, I’d appreciate it!
I also saw someone mention on Reddit that a Smiley BNC base connector might fill the gap…I’ll probably look into that as well.
Thanks again for the replies!