It works with both 3.6 ans 4.2 version.

The original tail was created to install the O3 antenna which is longer than the Avatar HD antenna and it was too hidden by the battery.

I redesigned the tail, raising the possibility of raising it by 2cm.

I found useless the holes dedicated to the ELSR antenna that could not be used with the antennas I had so I used the holes for the GPS mount (I don't use) to hold the antenna. So I redesigned those holes to better fit the ELRS antennas, as showed in the photos.

This might work with O3 antenna as well, they have the same size.