I ordered a second windshield from Safelight, the first replacement was done by the dealer. And there were three options, heated, diversity antenna, and just the windshield. I figured I had the diversity antenna (where else would you put the radio antenna?). And nope, so I'm guessing the antenna is for the satellite radio which is yet another reason why you can't retrofit one. Below is a shot of what someone did to get an aftermarket satellite radio on the car (not a fan). Anyway for anyone else doing this give them your VIN number so they get the right configuration. They are coming back next week with the right windshield. Sigh...