Can I buy/install a dual-band card in my Asus G53S?

[jdrake]

I have a G53S laptop and would like to be able to take advantage of the faster network, but the card it came installed with isn't a dual-band card. Asus was no help, avoiding the issue by simply telling me they don't recommend doing anything like that, but would not tell me whether it is even technically possible to swap in a different network card!

I just want to know if it is possible to get a dual-band card for my G53S. If so, has anyone done this successfully?