BT5 r3 Dual Band WiFi Recommendation?

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http://www.backtrack-linux.org – Hi all, I've spent ages looking around for a USB dual band WiFi card to work with BT5 r3. I've searched the forums, spoken to Alfa etc but haven't got a definite answer. Can anyone suggest a dual band (2.4 and 5ghz) wifi USB card, having spent ages trawling google and other forums etc i would be seriously grateful. I'm not too fussed about having a big antenna etc but anything will do so long as it can perform the usual tasks such as injection etc. Thanks in advance (HowTos)