I can't remember the dash configuration of a 2001 so i can't help with the radio placement. I am sure someone will answer that for you. A
As for the antenna, i have 2 mounted in 2 different ways..the 1st on is mounted in the center of the roof. i drilled a hole, use the proper mounts and installed it. The 2nd (added because i will need to pull the roof antenna for a rooftop AC unit) is mounted on a 3/4 diameter x 12 in long stainless steel grab rail from a boat. I used the end cap "stands for the tube off the boat and mounted it to the top of the pass door above the window. It holds a big XM radio antenna, a 48 in cb antenna and a quick relase mount for the TV antenna.
You can get the tube and ends at any marine supply store...