I still have to figure out a good place to mount my GPS, as while geeks are impressed by a palm pilot GPS with CAT5 tied to it with cable ties, normal people find it kind of, well, geekly.

I completely dismantled my GPS so that it was just the bare circuit board and the antenna, and tucked it into free cavities somewhere within the recesses of my dash. The antenna is mounted just above the heater vents, invisible beneath the plastic of the dash, but still high enough (and far forward enough, i.e., under the windshield so it can see enough of the sky) for it to get decent reception.