Hi, I am trying to find out which airport card I have in my MacBook, and which ones I can replace it with. I have a MacBook 1.1, which tells me I have an 'Airport Extreme (0x168c, 0x86)'. The Wifi signal has become very weak so I am trying to swap the card to see if it helps. I am looking on ebay etc but am not sure which will work with my machine. Any help would be appreciated!