FYI, I just finished an update to my original hack (I'm the author of that article on instructables.com).
Regarding attaching the antenna to screw #1, that may work (and I originally thought of that as well) but I didn't want to bypass any of the other components leading up to the original built in antenna (inductors L5 and L6). I was advised not to do so by a EE friend of mine.
The new revision has the shorter antenna (6.7"), a antenna tube added for durability, and overall cleanup of the article.
As always, I welcome all feedback from the BBQ community!