Troubleshooting Video Noise

Does anyone have some good guides for troubleshooting video noise on your goggles? There’s a couple of recent quad builds where the video looks amazing on the ground with the motors spinning (no props) but when it’s up in the air, it’s pretty bad in terms of getting lines across the goggles. See below (Rapidfire module in use, so this is good!) as a really bad video (also proved that rescue mode works!)

I’m looking more for how to check the electronics rather than the usual of add a capacitor, different antenna.

Thanks in advance.

long wait be how r u powering your vtx

From the FC; it’s the Diatone GTM530 so a very compact build and not enough space to put a separate BEC. However problem was solved by replacing the antenna lead. No obvious signs of damage on it, but replacing it did the trick.