I have the AirPort Extreme base station 802.11n and was thinking of using it as a way to access a wireless signal since my newly acquired G5 tower doesn't have a wireless card. Is is possible to use the base station as a wireless access instead of the card? Caveat: I have a MacBook Pro that I use with a built in wireless card. I get my signal from a wireless signal from my upstairs friend/landlord's network. He uses a Linksys router and modem from the cable company. Is there a way around buying a wireless card or USB adapter for this G5?