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Funny, I just replaced a mast on mine today.
I removed the plastic liner in the wheel arch, one bolt (12mm) on a bracket that the antenna mounts to, unscrew the chrome surround where the mast extends from (on top of guard), and remove the black plastic guard bezel.
I let the whole assembly drop so it clears the hole in the guard, then rotated the top towards the front of the car, then slowly pulled it out.
I didn't disconnect anything either.
Undo the phillips head screws holding the two halves of the plastic assembly together (7 screws from memory).
Open this up and you will see a round white wheel with a hole in the middle (one of the screws you take out goes through the middle of this).
Inside this wheel is where you will find the piece, or pieces, of the old mast internals.
Assemble in reverse order without installing the new mast.
Feed back up inside the guard and put the bolt back in the bracket to hold it there.
Take the old metal sleeve and small plastic spacer off the bottom section of the old antenna and put it on the new one.
Fully extend the new antenna so that the minimum of the toothed cable is showing.
Poke the end of the toothed cable into the hole with the teeth facing the rear of the car.
Turn your key to acc to let the motor wind all the way out.
When it stops, get someone to turn the key off while you guide the cable into the motor (you can do it yourself if you are fast or have really long arms), and then guide the antenna in until the sleeve, spacer, and all sections of the antenna have been retracted.
Turn on the car, and off, to test all extends and retracts smoothly.
Replace black guard bezel and chrome screw in retainer.
Replace plastic liner in wheel arch.
Job done!
Hope this helps, if it even makes sense.
PS: I converted from normal antenna on a car to a whip on the bulbar. There was no noticeable difference in the suburbs, but out of town a bit, the standard antenna was a bit better.
I have noticed that my Patrol factory antenna is better than all other vehicles I have driven/owned for reception and quality.
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