http://cragalaska.com/linux/linux_pix/dsc00116.jpg
http://cragalaska.com/linux/linux_pix/dsc00118.jpg
Open up the antenna end to expose the board, solder remove the antenna that's in place; small yellow brick looking thing. Purchase or build a RP-TNC pigtail (got mine off of a bricked Cisco Aironet 350) and solder this in place. The big pad I used for the sheath and the small pad I used for the core of the coax (it works (shrug)). The results in Kismet are very noticeable, I pick up APs a Kilometer or more away with my Zaurus
Now the continued health of my Zaurus I know not. At the end I use cardboard with electrical tape to support the pigtail weight, it's slid under the card between it and the plastic case. Have fun.--cg