Not to make an anti-climax of Drudge's high dudgeon or anything, but the Pittsburgh Post-Gazette ran a Sunday front-page article on this about a year ago. How did their intrepid reporters discover this deep state secret? Well, it seems that Cheney usually goes out there in a limo, and it's escorted by at least one helicopter. The locals all knew when he was there.
Errm, well, as the Amygdala link quotes extensively. Make that two and and a half years ago. But I remember it like, well, not so long ago. And it's a whole fleet of choppers and cars, not just a couple. Oddly coincidental thing is that Site R isn't all that far from Shanksville.