where is the factory location for the gps ant on a rb4 unit?

 

It's near the front of the dash underneath the plastic, near the center. If you pop off the plastic trim along the front of the dash that covers the speakers you'll see it. It sit'son a little metal pad with 2 screws holding it down. It's about a 2' cord that is strapped in 2 or 3 places running to the radio.