Here is a pic of my shortened antenna:
All I did was eyeball it to see where the top of the truck was. Then marked it, removed it, cut it down with a hacksaw. Then you can knock the ball off with a pair of pliers and then put it back on the top of the new end. Then just reinstall and it looks much sleeker! Another customization of BlackMagic & the Digital Electronics!
If you have any questions please let me know!