Originally Posted by Cr_Conrado
+ 2 x 18db 90º on the plane
Opps, I just observed that. How do you mean that? Directional antenna on the plane?
A 18dB antenna is highly directional. The plane turns, tilts etc. You lost the signal every time unless tracking on the plane as well. But such a tracking system is too complicated, way above the usual amateur level.
And what the 90º means? 18dB gain with that beam width is just impossible.