Review on Hooshion Extender Advanced Standard Controller by Tim Knoepfle

I don't understand why some say they don't work. I was able to walk about 1 mile in a dense Wi-Fi area before turning around. I've gone further than without her and still haven't pushed her to the limit. If you don't have the best range, you're either blocked by something, you can't get through, or you're not looking in the right direction. For $10, they're arguably the best accessory for the Phantom.