New Document Reveals Military Mystery's Powers

The document points out that "on the higher frequency end (VHF/UHF) transionospheric propagation is a ubiquitous element of numerous civilian and military communication systems, surveillance and remote sensing systems." In other words, messing with the ionosphere means you can shut down VHF radio, TV and radar signals at will. As radio hams know, the reflection and refraction effects of the ionosphere make a huge difference to long-range radio reception, and HAARP provides the only means of influencing that.

http://blog.wired.com/defense/2007/12/secret-document.html