the wire is behind the PS A piller. you have to pull those 2 bolt covers off (yes, it will leave a mark) then remove the bolt behind each cover. (maybe it was 7mm?)
under this cover down near the dash is a blue connector. if you have the 8" radio it will have 2 cables in this connector. unplug the connector. The thick one is for the cell phone connection, the smaller one is for the satellite.
If you look at this connector, there is a little insert you can unplug out of the side of this connector, remove this and you can pull the coax out of the connector. then plug connector back together again so Cell phone still works.
I ran a magnet antenna from out on the hood, through the fender into the PS door opening, then through a grommet into the body. I had to remove the lower PS kick panel to feed this cable into the truck. Then using a pickup tool, fished down through dash to below dash then I pulled wire up into A pillar where this blue connector was. The connector on this magnet antenna just plugs direct into factory harness.
NOTE. I pulled upper glove box, (and scratched my dash :( ). I bet just removing the lower glove box would supply enough vision to fish the pickup/wire grabber tool down through the dash)
Here is a pickup tool