I got these in the mail today. https://www.amazon.com/Alfa-2-4HGz-RP-SMA-Screw-Antenna/dp/B003ZWPRUI I used them to replace my ARGTEK panels, just to see if there was any difference. Well there is a huge difference. I flew one of my regular flights over a couple mountains and never lost signal, video or control. I usually get about 1.5 miles out and start losing signal bars, with these I had full signals at two miles before I turned around. Pretty awesome for $8.00 each.