here is a range of antenna you guys have not seen, these new models are the Blackhawk and the Nimrod.
These are the best available on 5.8 and 2.4 GHz, test recently returned perfect images at a range of 6KM with a transmit power of just 200 mW.
see www.williamsbuild@net, also
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If you're in the US, Ready Made RC carries Ibcrazy, TrueRC, and that other brand CP antennas for all bands.