How does ECHELON work?

ECHELON apparently collects data in several ways. Reports suggest it has massive ground based radio antennae to intercept satellite transmissions. In addition, some sites reputedly are tasked with tapping surface traffic. These antennae reportedly are in the United States, Italy, England, Turkey, New Zealand, Canada, Australia, and several other places. (4)Similarly, it is believed that ECHELON uses numerous satellites to catch "spillover" data from transmissions between cities. These satellites then beam the information down to processing centers on the ground. The main centers are in the United States (near Denver), England (Menwith Hill), Australia, and Germany. (5)According to various sources, ECHELON also routinely intercepts Internet transmissions. The organization allegedly has installed numerous "sniffer" devices. These "sniffers" collect information from data packets as they traverse the Internet via several key junctions. It also uses search software to scan for web sites ...  more