This is how i make my fpv tx antennas. I decided to use rg223 cable for the double shielding that makes the antennas more crashproof even if a little heavier.
I started to make my own antennas when after crashes had zero antennas to fly with.
I use this article for calculating antenna dimensions: http://www.flitetest.com/articles/Cloverleaf_Antenna
I tried over the time welding wire & copper wire for building the antennas and copper wire is the best option ( easy to bend and repair after a crash) the welding wire has very little copper coating and tends to break the soldering point even when handling it.
To protect the lobes i use can foam and cutting it to desired shape after it gets solid.
Hope you found the help in this video.
Ps: English is not my first language so sorry for any spelling mistakes...
Thanks and don't forget to like,share & subscribe !
Livyu