Looking closer at your machine's configuration, I think you will have to find a better way to mount your GPS antenna. It has no ground plane that I can see and it is right up next to ESC's and other electronics. Both bad things.
This always works for me: Take the attached template, print it out and tape it to a piece aluminum roof flashing (~0.01" thick.) Using heavy duty scissors, cut out the shape and drill the holes. You can then fold it into it's final 3D shape and use aluminum tape (used for duct work) to close the seams. It can then be mounted an inch or more above the FC with the antenna squarely in the middle. Very light, very effective.
- GPS shield.pdf
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