Have a look at
this site. The PCMCIA card seems to be effectively a Lucent WaveLAN/Orinoco card, but cheaper. It looks identical bar the differently coloured antenna, uses the same chipset and drivers under linux, and has an external antenna socket.
The access point unit is available with the same functionality of the Airport, plus more, and appears to be about the same price from what I've been able to find out so far.
Patrick.
Opinions expressed in this email may contain up to 42% water by weight, and are mine. All mine.