SKYREAT Copper Parabolic Antenna Signal Range Booster for DJI Phantom 4/4 Pro/Phantom 3 Pro/Advanced/4k/ Inspire 1 Controller Transmitter Signal Extender (2 Pcs) Design for your DJI Phantom 4/P4 pro/Phantom 3 Pro/Advanced/4K Inspire 1 controller transmitter. Accurate parabolic curved booster completely reflects the remote signal to the antenna (the focal point of the reflector) Parabolic reflector. No bump or deformation on the reflecting panel!!! It improves both remote control and Wi-Fi video connection performance for DJI Phantom 3 / Inspire 1, In an open testing area, The actual measurement distance greater than 2.8KM. Please make sure windsurfer Antenna faced in the general direction of the phantom for it to work properly.A opening area will be better to test.