Yes to the Wind Surfer. I got mine at Amazon for about $12.00 free shipping. I frequently fly a Litchi waypoint mission that goes out 7450 feet and starts curving back. There are numerous trees in the way but by going up to 400 feet I can keep both signals at 100%. They really do work by putting your signal where you need it while rejecting interfering signals from other directions!
Jim
WA5TEF
Jim
WA5TEF