thanks for all that.
I've contacted Navman (which as actually based) here in New Zealand - they do a "Stealth" GPS antenna with whatever connector you want plus a length of RG174 cable.
The stealth antenna is only 8mm thick and can be slid under the carpet on the rear parcel tray of your car.
One of the connector options is OSX which is what the Motorolas use right?

Lets see if they have a good price - if so, then I might be able to get a good deal deal for folks like you - airmail shipping from here for a GPS antenna won't be much and with our dollar half the $US I'm sure you'll get a good deal.

will keep you posted.