I'm pulling out my hair over this! I have my airport extreme base station working with my Powerbook perfectly but I want to add support for my parents winbox. I have using a Siemens External USB Wireless Adapter. The thing is the adapter does connect but doesn't get an IP address whatsoever while the Powerbook quickly and easily is able to get an IP. This is the setup ...

Cable Modem --> Cable Router/Switch ---> Airport Base Station

(Gets 1 Address) ------> (Gets the 1 address, gives local IPs via DHCP)-> (Shares 1 IP... default)

The PC hardware is set up correctly but I am wondering if there is something that I am forgetting with the base station. Help!