Older Macs with Airport cards (pre-extreme): will they work at all?

I have three Macs, only one with the extreme card (current MBP C2D). I've been using an old Airport Base Station and have been thinking I should upgrade it but am wondering if I do so, whether my other two computers will not pick up any signal. Obviously the two older Macs will not house the extreme cards, although I suspect they would not be shut out of a signal, however compromised, but would they be shut out of the wireless in the case of the new base station, with the 802.11n vs. 802.11g?
Thanks, Paul

Look:
http://discussions.apple.com/thread.jspa?threadID=838009&tstart=0

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