This is for the math wizzards out there or not. When it comes to the directional antennas on your controller, the correct elevation to point them is interesting when calculated. Instead of using math I tried with graphpaper. It looks like it may "add up" but maybe way off. When having the quad 10,000 feet away and up at 500 feet, according to the graph design, the elevation of the controller is very little above level. Curve of the earth was not considered because of the short distance involved. Even up at 2,000 feet (too high) the elevation of the controller was still not that great. So what do the math experts think?