This is a SMA mount that I've worked on for the Xhover GAPit frame. It sticks far enough out the back to get out of the way of the top plate. I added a "HD" version that is a little thicker to support heavier antennas.
Tag @whocaresfpv on Instagram if you make one and mount it! We'd like to see how it turned out for you!
I have updated both designs to be lighter and hopefully stronger. "Angle" version was added to give the antenna a 40 degree upward angle. It keeps those longer antennas out of the prop line.
Wanhao Duplicator i3 Plus
Print in TPU for best results