During active ionospheric research, the signal generated by the transmitter system is delivered to the antenna array, transmitted in an upward direction, and is partially absorbed, at an altitude between 100 to 350 km (depending on operating frequency), in a small volume a few hundred meters thick and a few tens of kilometers in diameter over the site.
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It is a popular target of conspiracy theories, and though many have expressed fears of the HAARP being used as a nefarious weapon, the scientists involved in aeronomy, space science, or plasma physics reject these fears as unfounded.
-Wikipedia
http://www.wired.com/dangerroom/2010/01/irans-nuclear-molemen/
Everything around the facility is blurry (lo res images), but the antenna array itself is clear!
http://www.wired.com/dangerroom/2009/08/haarp-2/