I think it all depends on the terrain, WiFi conjestion, cell towers in the vicinity. I live in the country and have gotten to nearly 4K with room to go further, just haven't pushed it yet.I have the FPVLR, and got to 5K at 150'. I still had 2 bars left.
The Alfa is basically a wifi router antenna. I was ecstatic too @4,323ft:Just for grins I replaced my stock antennas with two antennas I had from an old dead Linksys router. They are about three times longer than the stock antennas so I gave it a shot. WOW, I went out to 3,700 ft two times just to make sure it wasn't a fluke. My stock antenna would cut out about 700 ft. I'm a happy camper and didn't have to spend any extra cash.
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