mikez71
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There's 2 different rubber "seals" on these. The inner one is the actual seal and this outer one is just a rubber mount surface to protect the paint.
Here's some good info on this with some pics
Roof Leak from Shark Fin (Digital Radio Antenna)
Hello, My Silverado truck has about 120k miles and my warranty has already expired. It was raining all day long. The day after, I saw water drips coming out from the roof (see the attached photo). I went to dealer to find out where does the leak come from. They did water test and told me the leak...www.gm-trucks.com
Interesting, I always thought it was a crack, not an intentional channel.
Now I'm worried that by silicone-ing the gap, if any water seeps in from the front or sides, that it won't be able to evaporate.. which could cause what harm??