Wanted to share my experience (and solution)
So, my antenna also had broken gear-cable. It would go just barely under the top of the truck, and would retract about halfway down. I knew it was a broken gear-cable, with my experience with a power antenna on my '91 Maxima (RIP).
So, I tried the FSM method of "yank as hard as you can" when antenna motor assembly is extending antenna up. That didn't work out. I yanked up with at least 80lbs of force; antenna did not budge.
Then I figured to try bending it about 6" above the base and then using a vice-grip so I can hammer upwards on the vice-grip, hoping to knock it up and out; same result - didn't come out.
By the end of day, none of the antenna was exposed outside of the antenna assembly.
Long story short (about 1weeks time of sitting and thinking of how to extract the remnants of the antenna out).
I took the above suggestions and bought a drill bit (synar and gcjazz12 comments above). Started drilling/shaving the inside of the remaining/stuck piece of antenna inside the base-mast. The base-mast looks like an aluminum tubing that houses the mast when fully retracted. I removed the base-mast from the main assembly and drilled/shaved the remaining antenna piece inside the base-mast.
Once I got all the remaining antenna pieces out (shaved out), there seemed to be another layer of metal, but it looked like it was the inner liner of the plastic piece at the top of the base-mast. In any case, the new antenna sleeve (the piece that fits over the new antenna - should come with one) fit inside the plastic section of the base-mast so I assume it was okay. What WASN'T okay was the actual antenna itself. At the bottom of the antenna mast is a retainer/lip that prevents it from slipping out past the antenna sleeve, but it looked like the same diameter as the antenna sleeve, which fit into the plastic section rather easily. Well, that bottom lip of the antenna mast would not feed into the base-mast.
Frustrated... I just inserted the antenna mast up from the bottom of the base-mast (remember, base-mast is removed from assembly), and fed the antenna gear-cable into the assembly using the same method described by others; that is:
- turn radio on
- wait for motor to stop running
- power radio off
- once motor starts winding again to retract the antenna, feed the gear-cable in
- as the new gear-cable is going in, quickly re-insert the base-mast into the main assembly
- I inserted the antenna sleeve from the top of the base-mast once the new antenna was nicely seated and fully retracted inside the base-mast.
and I put the antenna assembly back into the fender well and replaced everything.
good times
I would have opted for a standard/non-power antenna - I just didn't want to fish through the back of the console to re-wire the antenna wiring.