Looks exactly like the one from the iPhone 4, but a little taller.
The Bury System 9 cradles connect to the Bury System 9 baseplate connector in the car (where the touch-adaptor plugs in). Which in turn connects to power, and the car's external GSM antenna.
There's no antenna in the cradle itself. This is paraphrased from the Bury Site, and confirmed from experience with the iPhone 4 version of the dock.
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