I say the broken antenna thing is very rubbish. I cannot believe that all of a sudden so many people end up with hardware failure related to the antenna, especially since it's coincidental with the software upgrade (since iOS 6).
So, either:
1. There is a firmware problem with the wifi from a particular supplier that was introduced with iOS 6 and it jsut never gets fixed.
2. There is some hardware problem, which again probably affects a particular kind wifi hardware version, and somehow iOS 6 is breaking it. Again that would be software related. We've heard of people having the issue arising on their iPhone 4S and they had the phone for a while, while others had bought it recently.
For #2, let's say that the antenna or wifi chip or whatever is really broken, it used to be that it would still be visible in the settings. I mean, it could be that the wifi would be flaky and unreliable but it appears to me that there is something in iOS since version 6 that flags it and disable it. I'd like to have a wifi that disconnects often but could still be useable rather than none at all!
Question: could anyone confirm that they heard (first hand) of someone with the greyed out wifi downgrading to iOS 5.x and having their wifi working again? If so, the problem definitely seems software related.
Cheers