I had a similar problem, I live in the city and there is a lot of interference. I just bought these from Amazon for my other drone and what a improvement. I move it around from the phantom bag to the XSP case, and now I am able to flight at places where I could not before.
Amazon.com : Gigibon GG-0963 DJI Phantom Quadcopter Accessory: Antenna Range Extender, Signal Booster for DJI Phantom 4, Phantom 3, Inspire 1 Controllers : Camera & Photo
