In this video we take a look at a cheap antenna booster from ebay. This is a 3d printed reflector designed to be used with the DJI Phantom 3 controller. It is claimed to be a parabolic reflector and will double the operating range of the controller. Now there are different versions of this available and some look to be better constructed than the one I have but this one is not a Parabola and does not have a focal point.
The parabolic curve:
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