Spoiler: Nothing happens for me. I've tried a number of times over the last couple days and don't lose signal. From the description of the antenna issue I keep hearing it sounds like it should happen to everyone, but I'm completely unable to recreate it. I wonder how widespread this actually is.
I'm right handed, but almost exclusively hold my phone in my left. For now this is a non-issue for me, personally.
Recorded on my old 3GS