Dave that's a good point about antenna spacing. I will need a transponder and ADS-B antenna on the bottom, so I think I just may have to mount the antenna on the top.

Just for an interesting piece of info, years ago when I was building my RANS S-6S my buddy Steve was building his Kitfox. He also owned a small biz called Sta-Lite Aviation and he made comm antennas and sold them through Wag-Aero. These antennas did not require any kind of ground plane so he mounted it in the vertical stab of his Kitfox. He made one for me and I also mounted it in the tail of my S-6. It was completely unseen and obviously created zero additional parasite drag. Unfortunately he no longer makes antennas! But the antennas worked flawlessly. I wish I could still get one so I could mount it in the tail again!