Have not had any issues within my 1/2 mile range. I'm sure if I go out further, I will have to relocate the transmitter so I can position the antenna down.
Getting excellent signal from the downlink with the antenna horizontal. I have not tested anything beyond 1/2 mile though. My waypoint demo's are all within line of sight at the moment.
I have the AeroXCraft F550 landing gear and the VTR-GP gimbal with a GoPro HERO3. Very nice setup. Great quality! The gimbal works very well, and hooks up to the F550 Wookong-M super easy. Be sure to get a BEC!
http://www.aeroxcraft.com/index.php?main_page=product_info&cPath=4&products_id=29...