Summary Yagi antenna is designed for DJI Phantom Vision or Vision Plus as additional extender for transmitter antenna. Opposite to parabolic antenna has lower gain but wider angle of radiation. I when I tested reached 808m/2650ft in CE mode i.e. up 200m/650ft than without yagi. I designed it for use reamins of Cu sheet and I suppose better results with Al or Cu rods. Thanks to http://www.k7mem.com/Electronic_Notebook/antennas/yagi_vhf_quick.html