Re: Broken Antenna
The antenna bolt actually fits pretty loose (the serrated rubber bottom of the antenna mast is what "clicks" it into a tight fit) . My mast was installed loose and almost fell off before I discovered it, and tightened it. If you were lucky and did not damage the threads, you might we able to get it to turn out. Can you take and post a photo of the broken bolt, for a better opinion of the situation. Unlike others, I do not believe you will have much success trying to drill a hole in the piece of bolt that is left in the hole - to use an extractor.
You might be able to get the broken piece to turn using a small screwdriver, needle-nose pliers or even a pencil/eraser (might have to whittle it down to a smaller diameter) to get it to turn out a few rotations until you can grab it with a pliers.