United States National Radio Quiet Zone

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The National Radio Quiet Zone spans West Virginia, Virginia, and a small part of Maryland.

The United States National Radio Quiet Zone is a large area of land centered between the National Radio Astronomy Observatory at Green Bank, West Virginia and the Sugar Grove Research Facility at Sugar Grove, West Virginia. The Radio Quiet Zone is a rectangle of land approximately 13,000 square miles (34,000 km2) in size that straddles the border area of Virginia and West Virginia. It includes all land with latitudes between 37° 30′ 0.4″ N and 39° 15′ 0.4″ N and longitudes between 78° 29′ 59.0″ W and 80° 29′ 59.2″ W.[1]

The National Radio Quiet Zone protects the telescopes of the NRAO facility and the antennas and receivers of the U.S. Navy Information Operations Command (NIOC) at Sugar Grove, West Virginia. The NIOC at Sugar Grove has long been the location of electronic intelligence-gathering systems, and is today said to be a key station in the ECHELON system operated by the National Security Agency (NSA).[2]

The Quiet Zone was created by the Federal Communications Commission (FCC) in 1958 to protect the radio telescopes at Green Bank and Sugar Grove from harmful interference. Restrictions on transmission are tightest within ten miles of these sites,[3] where most omnidirectional and high-power transmissions are prohibited.

Not all radio transmissions are prohibited in the Radio Quiet Zone. For example Citizen's Band radios, police and ambulance radios, and fire department radios are used there. However, large transmitter owners must typically coordinate their operations with representatives of the NRAO, which oversees the NRQZ in agreement with the Sugar Grove facility. The only broadcast radio stations in the inner core of the Quiet Zone are part of the Allegheny Mountain Radio network—with just one station in the AM band, and several low-power FM stations. Exceptions to the Radio Quiet Zone restrictions are usually determined on a case-by-case basis, with preference given to public safety concerns, such as remote alarm systems, repeaters for first responders, and NOAA Weather Radio. Due to the restrictions, the area has attracted people who believe they suffer from electromagnetic hypersensitivity.[4]

Most broadcast transmitters in the Quiet Zone are forced to operate at reduced power and use highly directional antennas. This makes cable and satellite all but essential for acceptable television in much of the region.

Chapter 37A of the West Virginia Code strictly regulates radio transmitters within 10 miles of the Green Bank NRAO facility.[3] Staff of the NRAO routinely patrol radio transmissions within a 20-mile radius of the Green Bank Telescope.[5]

Counties inside the Zone[edit]

Maryland counties[edit]

Virginia counties[edit]

See also, List of radio stations in Virginia which includes several AM and FM stations within the zone.

West Virginia counties[edit]

See also, List of radio stations in West Virginia which includes several AM and FM stations within the zone.

Cities inside the Zone[edit]

Virginia cities[edit]

West Virginia cities[edit]

Clarksburg, West Virginia, and Lynchburg, Virginia are just outside the Quiet Zone.

See also[edit]


  1. ^ Official website, National Radio Quiet Zone
  2. ^ "Interception Capabilities 2000, Sugar Grove, Virginia – COMSAT interception at ECHELON site". Interception of Communications Section. Leeds, UK: Cyber-Rights & Cyber-Liberties (UK). May 11, 1999. Archived from the original on May 30, 2008. Retrieved September 14, 2011. "Interception Capabilities 2000 Report to the Director General for Research of the European Parliament (Scientific and Technical Options Assessment programme office) on the development of surveillance technology and risk of abuse of economic information." 
  3. ^ a b "West Virginia Code, Chapter 37A". NRAO. Retrieved 2013-10-08. 
  4. ^ O'Brien, Jane; Danzico, Matt (September 12, 2011). "'Wi-fi refugees' shelter in West Virginia mountains". BBC News. Retrieved September 13, 2011. 
  5. ^ "To keep the zone protected from signals that could confuse the telescope, Niday and others from the NRAO drive the 20-mile radius around the Green Bank Telescope weekly, policing for possible interference." "Enter The Quiet Zone: Where Cell Service, Wi-Fi Are Banned". NPR. Retrieved 2013-10-08. 

External links[edit]

Coordinates: 38°22′30″N 79°30′00″W / 38.375°N 79.5°W / 38.375; -79.5