Hello everyone.
This is a place to collect links to good diy guides and antenna manufacturers.
DIY:
This a link to build instructions for crosshair style 5 - 10 dBi directional antennas. I made some for 2,4 gHz a while back and they work well with OHD.
https://fpvlab.com/forums/showthread.php?3626-Crosshair-10-dbic-Circularly-polarized-antenna-tutorial!
How to make cloverleaf antennas:
https://oscarliang.com/make-diy-cloverleaf-antenna/
BUY:
Custom made antennas from germany:
https://antennenfreund.de/
Custom made antennas from poland:
http://prodrone.pl/
High Quality antennas from the USA:
https://www.videoaerialsystems.com/