The Quiet Zone

A legally enforced radio-silent zone the size of a small country

Drive west from Washington toward the Allegheny Mountains and before long the car radio fades to static and the phone loses its signal. You have entered the National Radio Quiet Zone, roughly 13,000 square miles of the Blue Ridge and Allegheny Mountains, a near-rectangle straddling Virginia and West Virginia with a sliver of Maryland. Inside it, radio transmissions are restricted by law. The Federal Communications Commission created it in 1958 to protect the radio telescopes at Green Bank, West Virginia, and the listening station at Sugar Grove, now run by the Navy and said to be a key post in the National Security Agency's intelligence network.

The giant at Green Bank is the Green Bank Telescope, the world's largest fully steerable radio telescope, sensitive enough to pick up radio waves emitted just after the birth of the universe, signals so faint they are easily drowned out. Restrictions tighten toward it. Across the zone, broadcast transmitters run at reduced power with directional antennas, and big stations as far off as Charlottesville must coordinate with the observatory. Within ten miles, West Virginia's Radio Astronomy Zoning Act strictly limits transmitters, and within two miles the rules are tightest of all. On the observatory grounds Wi-Fi and cordless phones are banned, vehicles must run on diesel because gasoline engines spark, and digital cameras are forbidden though film is fine. Emergency radios, CB and NOAA Weather Radio are allowed. GPS works, since the zone has no say over signals from space.

For years the observatory has policed the area for rogue interference, from faulty wiring to microwave ovens and even vacuum cleaners, whose motors throw sparks; it has no real power to enforce beyond asking, though the FCC can fine violators $50. Residents of Pocahontas County, about 8,000 people at the heart of the zone, grew used to life without mobile phones. The site director once noted that when she leaves her desk, the internet stays behind. The silence also drew people who believe they suffer from electromagnetic hypersensitivity, though experiments point to the nocebo effect rather than the waves themselves.

The quiet is wearing thin. Enforcement has eased, Wi-Fi has crept into homes, the clinic and the senior centre, and in 2019 the observatory's interference team was finding about 175 hotspots within two miles of the telescope. By 2024, 99.5 percent of the zone was reported eligible for satellite internet. The telescope still listens.