the avic is getting put in on thursday, i have almost all the info i need (bypass etc), i live in nyc so i want the gps antenna hidden. where have you guys with the mustangs been putting them? seems like in the dash is the best place. i read that the foil that comes from pioneer doesnt give very good gps reception, so i should have it installed on a metal plate that i can stick in the dash correct? my installer suggested on the top of the dash, but i want it hidden.

could i use 3m double sided tape on the top of the antenna to stick it to the bottom of the dash, and then put a metal plate underneath? or would it be better to 3m the plate to something and then just have the antenna stuck to it with the magnet?