I lost my antenna on the 4th flight after screwing the VTX antenna on, but luckily Arducopter saved the day (thanks to the developers):
I can't recall how tight or loose I screwed the antenna, but next time I'll be sure to tighten the SMA connector properly or perhaps use some 3D printed SMA finger wrenches such as: https://www.thingiverse.com/thing:1678149
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