The router is a Buffalo WHR-HP-G54, you can find them on ebay:
http://search.ebay.com/search/search...tle=WHR-HP-G54

I use a custom dd-wrt firmware that has AutoAP build in (dd-wrt.v24_micro_generic.aapng.20070822RC1b.zip):
http://sourceforge.net/project/showf...roup_id=185052

It's not a USB powered router and requires 5V 900mA power source. The cigarette lighter to usb that my bluetooth gps uses has an output of 5V 850mA, so I just modified a USB cable and attached a power jack at the end to be able to power the router.

The antenna I use in the car is the one that comes with the router. You can get some high gain omni antenna, but Omni antennas have a donut/flattened ball signal pattern and if you go verry high on the dBi gain, the donut will become a pancake and will be very easy for you to be "under" or "above" the pancake and have no signal. For me the out-of-the-box antenna works fine.

I set the Xmit Power for the router to 28mW (you can go all the way to 250mW if you want to convert your car in a microwave, hehe).

For other settings, see the original article:
http://www.i-hacked.com/index.php?op...essfully+saved.