is it OK to place the antenna for the D3 on the roof? or on the dash?

you dont need to go to the roof. the dash is fine

you dont need to go to the roof. the dash is fine

Thanks for the help. Does it damage the antenna if its on the roof? I just want to know if it does for further reference.

No, it's weatherproof, and you can mount it on the exterior of the car. It's just that there's no point to mounting it on the roof and running the wire through some weatherstripping somewhere and risking a leak when you can mount it at the front of the dash and not have to worry about it, while still getting a good signal.

thanx for the help