When we bought it a couple of years ago, our car came with a few weeks of satelite radio. It was nice, but we decided not to keep the subscription. A few weeks ago, the brushes of a car wash destroyed the dried out rubber antenna cover. Since we aren't using it anyway, I decided to replace it.
No auto parts stores had a replacement rubber cover for the 6" satelite antenna. Finally, it hit me that any antenna would work, but the shortest I could find was 13"; no one would notice but me, but I would notice. I reasoned that if the antennas had standard threads, it shouldn't be too hard to find a bolt or machine screw with those same threads. I was lucky enough to find such a scew in my garage! The only thing left to do was to coat that bad boy in Sugru to blend in and protect.
Step 1: Sugru application
To apply an even coating and shape, I got out the trusty 19.2 volt craftsman drill. Overkill for this application, but you never know.