ALP GPS Antenna's

[991TurboS]

itll work fine behind the dash

not sure how your car is exactly but the shark fin on the roof is usually for satellite radio etc...GPS reciever (at least in my vehicles) is behind the nav unit in the upper part of the dash.

Maybe it is the satellite antennae and not the GPS.

I went ahead and mounted the antenna in the trunk area of the car, which in a 911 is the front. It is sitting under the black plastic cowling lining the bottom part of the front windshield, so it should get a good signal. It is a dry location.