I finally saw the antenna issue in my bedroom this weekend on my iPhone 4. I apparently touch the right spot when I use the iPhone for reading. My apartment is in a weak area anyway so I'm not really surprised. I still have enough signal to talk and since I'm on a wifi network it doesn't impact my speed at all. It's still the only place I've been able to see it happen in Japan. The places around me are ok, so I think my building is worse than others.