Dozens of Americans who claim to have been made ill by Wi-Fi and mobile phones have flocked to the town of Green Bank, W.V.An estimated 5% of Americans believe they suffer from electromagnetic hypersensitivity (EHS), which they say is caused by exposure to electromagnetic fields typically created by mobile phones, Wi-Fi and other electronic equipment. Symptoms range from acute headaches, skin burning, muscle twitching and chronic pain. Green Bank is part of the US Radio Quiet Zone, where wireless is banned across 13,000 square miles (33,000 sq km) to prevent transmissions interfering with a number of radio telescopes in the area.The largest is owned by the National Radio Astronomy Observatory and enables scientists to listen to low-level signals from different places in the universe. As a result of the radio blackout, the Quiet Zone has become a haven for people desperate to get away from wireless technology.Learn more from the BBC.