It's funny how that thing has been there for over 4 decades but when the HAARP system was built more recently, lots of people went nuts about how it would burn holes in the ionosphere.
Can you say phased dipoles?
Much of what we've learned about the ionosphere more recently comes from satellites and probes.
Another vid showing more details on how the site works.
http://www.youtube.com/watch?v=2i30zgahyV0&feature=relatedGotta love the scope cameras with the Polaroid film. I wish I had a dollar for every time I took a shot with that stuff! Long gone now. All computer generated now with color and all!