If the antenna is stock and like my '65 it's very easy. Unplug cable from radio, unscrew pall nut at top of antenna mount, push antenna down enough to see base mount (underneath), tilt the base mount using a screw driver and withdraw antenna and cable. If you want to review this before accomplishing it, visit O-Reilly's or Autozone. I've seen antennas there that worked exactly like the original Ford antenna. They simply have a tilting base, that when vertical will slip through the hole. When the base is horizontal to the fender, it won't come through the hole.