This is a very nice 4 antenna kit, made by hand, each antenna is individually tuned on a HP Agilent Spectrum Analyzer for best return loss figures. This setup will easily triple your range. The 2 parasitic disk helix antennas are 9.3 dBi with a generous rear lobe of coverage behind the pilot, and the 2 5-turns helix antennas are 12dBi and provide more range if pointed in the right direction.
They require a 8mm wrench to be secured to the googgles in the disired direction.
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