sounds like fun, but isn't that a little...ah...well, wrong?
Well anyway, would you be willing to crack open the case and fish out the built in antenna? You could rout it to a connector that you could attach an external antenna to and un-plug it when not "War Driving" or "War skating" or "War Cycling"
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Macbook 2.1 core duo 1gig 160gb sata
iMac g5 w/1 gig 160gig all-in-one and SWEET!
iBook G4 IGhz
Quicksilver Dual 800's
iPod touch
"Guys, I think we just lost the platform here" Pete Conrad
When in doubt, try SCE to AUX