I posted about this way earlier in the thread, but, at least in my case, I know that at certain times my Vapor was coming into contact with the metal antenna. I could tell that the thin sides of the Vapor were defecting enough at times to touch. And, as you stated (and I stated as well), the insulating material they use compresses over time to the point that it's not really providing any support. To test my theory of the Vapor touching the antenna, I put a thin strip of receipt paper between my antenna and Vapor, and tightened down the Vapor (keep in mind that this was in an area of the Vapor where there was no cushioning material installed. When the Vapor was installed, this very thin piece of paper couldn't be pulled through the case. If the Vapor wasn't touching here, this piece of paper should have been able to be pulled right out. But you could feel the pressure of the Vapor pressing on the paper, not allowing it to pull through. My signal was total crap after installing the Vapor as well. As an experiment, I completely insulated the entire inside of the Vapor with an insulating rubber material that I have, and after that, strangely enough, my signal was perfectly fine, and my GPS became far more accurate. But I felt as though I shouldn't have to "fix" an $80 case, and instead of dealing with the nightmare that is Element Case's customer service, I just sold it on eBay for a profit. But...after I insulated the entire inside of the Vapor myself, all problems I had noticed before were corrected or greatly reduced.
Thanks that's good info. If things degrade I'll add some foam strips or tape, easy enough. I'm so into the looks I'll
go far to make it work if it starts to not work.