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You could just swap the windshield for one with an antenna and then add the cable. The cable is pretty cheap and you should be able to pick up a windshield fairly cheap from a wrecking yard or craigslist, something like that. My local pick n pull always has 4 or 5 of these trucks at least any time I've gone.
I looked on my windshield and there was no round metal connector but I did see that the dash cover had a curve where I would guess the connector would have connected, so I guess I'm out of luck there. I think I might try one of those little antenna boxes that you can mount anywhere on the car, mainly because it would be a lot cheaperSent from my iPhone using Tapatalk