Need Help With a Stereo Antenna

More on the shark fin: It looks like the body of the antenna is some kind of composite so I'm hoping that the electronics are in the base and the top, the "fin", is just composite material. If that's the case, I might be able to trim it to fit. Stay tuned, news next week.
The reason the sky is important is if the GPS can't "see" the sky, e.g. you bury the unit under the dash, the signal is attenuated. I know, I tried it. Besides, this is why you build them isn't it?