I'm a newbie to the Phanton 2 Vision + so please excuse me... I hear about guys flying 1000+ feet with their Phantom 2 Vision +, but if I get higher than about 400-500' (vertically above me) it loses signal and flashes up the returning home icon. I have new batteries plus everything is fully charged on Phantom 2+ in addition to the receiver on top of controller. I even purchased the FPV booster ap at the suggestion of a friend and I think it helped but not more than about 100'. I'm running it through an IPhone if that's any help Any ideas? Thanks !!