Will the r52h card support 3.x frequency? Or do you know any athereos chipsets that will?

I think "NO"

What is 3.x ?
RB52H supports
Frequencies:
802.11b/g 2.192 – 2.507 (5 MHz step); 2.224 – 2.539 (5MHz step)
802.11a 4.920 – 6.100 (5 MHz step)

I meant any 3ghz frequency supported but, you answered my question. Thanks sergejs