Quote:
that seems similar with a higher gain (22db),
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That gain number is bogus. Some clown at the Chinese company who makes the antenna who didn't know their backside from an antenna made the false assumption that since each half of that antenna when considered by itself was around 11 dB gain, two of them must therefore be twice that, or 22 dB. The seller doesn't seem interested in correcting it although they've been told the number is bad.