I've done 15,000' with stock P4 controller using windsurfer. That test had full signal bars the whole flight. That's using ch20 and 4mbps bitrate.All you have shown is that it was a bad investment for you, and you did the installation, so whose fault are the bad results?I got 5.8 miles of range control on my P4 last night to 51% remaining battery on my DBS-02 mod with boosters attached on a GL300A controller. Without the boosters on the same transmitter mod, I got 12,500 feet. With just a windsurfer and the stock P4 crappy transmitter, I got 6,700 feet. Without the windsurfer, I get 2,500 feet! Those are my results!
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However, I've noticed my P4 can be temperamental, losing full contact with moderate clear view distances that my P3P would be rock solid, 3000 to 4000' range