Hey Guys,
Just my 2 cents regarding the installation. Thanks again to 816PWR for the detailed installation steps, saved me a lot of time fiddling around . Mine was just the replacement of a bent antenna mast. I have few points to add to the installation steps:
To unscrew the top nut, you can also use two very small screw drivers and hold them in each hand and rotate the nut counter-clockwise.
If the antenna mast is bent as in my case you may have to pull it out of the factory metal finisher from the top instead of pushing it down through the bottom. Of course you can't do the former because of the mast's bottom edge is prevented from going through the factory metal finisher's bottom edge. I end up making some room between the two edges and cutting the wider mast edge and allowing it to be pulled out from the top.
Here's a crude picture I drew up showing the different sections concerned:
Hope this helps.
Cheers