You can remove the whip with I think a 3/8 box wrench. The base is covered with a metal cap. you can pop that off with a small screw driver from the front or the back. Once that is off you can see there are 3 phillips screws and the antenna base will come off. The hard part is routing the antenna cable.
Good Luck
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See my mustang at
prime-fe2.lvcm.com/sparkckr/pineapple.html