The Original 3d printed DJI Phantom 3/ Inspire 1 Controller / Video Range Extender + FREE GIFT! ~ This simple Parabolic reflector will significantly increase your controllers range Without Any Modifications to your controller. It works by focusing the signal that would normally be transmitted 360 degrees, back in the direction of your Phantom, increasing your range. Research windsurfer on Bing.. They work! & Fits in case! Installation is easy. This style slips over your antenna's for easy on/off instillation. I offer other styles that mount differently with the same performance. You also get a Free Antenna spacer to use when your not using your windsurfer. Thanks for looking & safe flying. I am not a dji dealer.