After breaking my VTX several times, I decided to install a small pigtail on my ZMR 250 frame. If your frame doesn't already have such a thing - I'd strongly recommend it, as it move the impact away from the delicate SMA connector on the VTX to the skew or the pigtail.
If you want to get yourself a bignose13 skew or pigtail, just post in this thread -
Here's a link to the skyzone VTX that seems to be crap -
..and here's the AOMway equivalent, that people seem to highly recommend (although I've no personal experience with it)