There are two antenna mount options:
These mounts are designed to work without any pressnuts on the back of the ToothFairy 2 frame. Pop the antenna mount in place and drive an 8-10mm screw through the TPU itself.
The GoPro mounts are designed to be as light as reasonable so they do not provide 100% protection. This sort of build is not even designed to carry a GoPro but we know everyone wants to as we do this ourselves.