To clarify, the antenna connector on Airport cards looks similar to PCMCIA cards with antenna jacks built into their small antenna. I'm sure the Airport slots are just slightly tweaked PCMCIA slots, to keep the cost down. (Considering Airport stuff has been around for a while now, I bought the base station because $300 was cheep back then).

And don't buy the XServe as a desktop machine. Sure, it's nice, but it's also noisy as hell being a 1U box. A bit worse then the new air sucker PowerMacs.