Can someone tell me where the Onstar antenna is located on the C6? I got the 3LT package but the salesman tells me the black antenna on the roof is for XM only. I wrote to Corvette.com and they "have to get back to me" to give me an answer. Thanks in advance to anyone that can help. Also, what is the little 1/2 dome shaped device in the grill on near the windshield (top of the dash area). Again salesman not sure, says he thinks it's a sensor for the "running lights" but I think it's not. Thanks

That thing probably tells the car when to automatically turn on the headlights. I've got onstar on my '05. The rear view mirror houses a lot of that stuff. No antenna on my roof.

On my 05 the service department said it was in the rear facia of the car. The newer C6's it should be in the side mirrors.

the box next to the rearview mirror is the one that has what you are looking for on you 007,no black horn on the roof,mine has XM and On star, 3lt and that is what I was told