The National Security Agency was once known for its skill in eavesdropping on the world’s telephone calls through radio dishes in out-of-the-way places like England’s Menwith Hill, Australia’s Pine Gap, and Washington state’s Yakima Training Center.
Today those massive installations, which listened in on phone conversations beamed over microwave links, are becoming something akin to relics of the Cold War. As more communications traffic travels through fiber links, and as e-mail and text messaging supplant phone calls, the spy agency that once intercepted telegrams is adapting yet again.