Have you tried...
pointing the remote at your head? I'm, sort of, kidding about this, but it really seems to work. Don't mean to thread jack, and I'm thinking about doing the antenna relocate too, but I've found I can almost triple the range of the stock key fob just by placing the tip of the fob to my temple and pressing the button. I have NO idea why this works, but it does. Maybe your skull amplifies the signal? I don't do it that often so I don't think that I'm giving myself brain cancer. Just do it as a little "party trick" when I have friends with me.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless