If it has a little dome on the front of the dash, that's it. I do know that is for satellite radio, but not exactly sure if it's also for normal. I had a 2005 NBC, with Sirius satellite, and I remember the dome.
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Not sure where to point you for the answer on the antenna.
As dyned said if you have a sat radio there is a lump on the center dash panel, if you have a non-sat radio look closely at your front windshield you should see a very small wire imbeded in the glass. Thats your antenna.