Just wanted to see what others had done for their GPS unit and the location, rather than out a window for 2007 Taco 4dr

You can mount the antenna at the front of the dashboard and get good signal. Anywhere is fine, as long as it's not obstructed by any metal. Id DOES NOT have to be installed on the exterior of the car. If you're going to mount on the dash, though, you'll have to use the little metal adhesive pad underneath of it.

I have my gps antenna in my Taco stuck to the metal support brace that runs under the dash. If you drop down the glove box you can see a nice open place to stick it in the far right corner, my reception is fine and the antenna is not visible.