Be warned that NS 0.4's Atheros support is poor. Yes, it works, but the driver has the annoying habit of reporting everything it's seen in the last 2 minutes, rather than what it can see right now. NS 0.4 works around this but it may cause APs to appear and disappear.
Use an Atheros card in NDIS 5.1 mode to see it without the workaround. It's scary.