This was my very first 3D modeling project: I have a Jeep JK with the CB antenna mounted to my license plate (UltraMount), and because my Jeep is lifted (4" with 35" tires), the antenna hits the garage door when I park it. If I forget to pull the antenna down before I close the garage door, the antenna gets broken off.

This little retainer attaches to the side of my hard top and pulls the CB antenna down to about 1" above the top of my jeep, so I can enter the garage without problems.

I used ABS filament, but I think ASA would be ideal, since the retainer is exposed to the sun. Then just glue the two pieces together.

To mount the retainer, I picked up the following hardware from Home Depot (all stainless steel):

• 2 x #6-32 x 1/2 in. round head combo machine screws
• 2 x #6-32 cap nuts
• 2 x #6 lock washers
• 4 x #6 flat washers

I didn't add any kind of gasket...I'm hoping that the ABS pressed against the plastic hard top will provide a waterproof seal. If not, I'll find some sort of material to use as a gasket.