I promise I'll keep this one short. We are forever taking antennae on and off our quads and goggles as we arrive and leave our flight locations. I'm guilty of being too eager to get in the sky and not tightening my antennae correctly thereby leaving a poor connection to the active element on both the quad and goggle ends. Using a spanner is not a fix I'd recommend as it is easy to over-torque and damage the antenna or mount.
The fix here is really easy and I got the tip from my favourite VAS antennas which all include a plastic knurled grip (now I know why). Using a knurled grip that sits over the hexagonal drive on an SMA-style connecter allows you to get a better grip and more torque on tightening whilst avoiding over torquing as above. To put this another way - using these grips allows you to get the right tightness every time - good for the best connection and it will also help them coming loose in flight.
Perhaps you are more disciplined than me around tightenning antenna every time before and after flying but if you are over eager like I sometimes get I would strongly recommend these for easy gains on a better and more consistent FPV feed. Below is my old modded Furibee X215 fitted with a AKK FX2 mini pro vtx (upgrades detailed here), an emax stubby pagoda on the quad and 2 long emax pagodas on my aomway commanders (reviewed here). All 3 antennae have the knurled grips.
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