I have a P3P, MavicP, and a P4P. The P4P is relatively new and it's been gnawing at my brain because of the lack of range less than a mile and it's already losing video. I have the Maximus DBS itelite NO AMPS modified antenna on the P3P and it's rock solid in video and control signal as far as the battery allows ~33,000ft round trip. Last night I went out to flat farm land to test and what the problem is, or reason, is that the second there's not a clear line of sight with the P4P the signal is gone. I mean like one leaf and it's game over with the stock antenna, however it just sailed along mile after mile with NOTHING in the way at all. That's makes me feel much much better because it's hard to find anything on the web with any data on the P4P antenna mods or not. I was using an iPad 4 mini and discovered that may be a problem and that I don't understand at all, it's too much for it play some video? I used my iPhone 7+ with nothing blocking LOS but plenty of high powered wires all rock solid signals. The Mavic Pro stock antenna by far has the best signal in town with trees and buildings, etc. I don't know if anyone is interested by I was dying to know if the P4P was going to crap out at 3500 ft when I routinely flew 30,000 with a Phantom 3 and almost that with just windsurfers.