wifi biamps receiver sensitivity

Help, I bought one of those old proxim cards with a spectrum analyzer program, the analyzer works fine but the proxim card is very deaf, even with a good antenna and coax. I would like to improve the receive sensitivity using a biamp. Most mfgs of these clain 15-18dB receive gain but you never know if thats real or just on paper, I really need one with good receive gain and low noise figure. Sense i wont be using it for transmitting this is very important . Does anyone have any experience with any of these, either indoor or mask mounted?

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