You bring up a good point on replacing the mini PCIe networking card. Looking over a couple of options at Newegg, it looks like the 300 Mbps Intel card (model 622) is able to do both 2.4 & 5 GHz with only two antennas. The 450 Mbps Intel card (model 633) has three antenna connections though. I think it would be tempting to go with the 300 Mbps version just so I wouldn't have to figure out the wiring and/or place to put a third antenna. Even with the 2 antenna version, though, I would need to probably get a replacement antenna that could receive 5 GHz. May have to research this a bit more...