National Radio Quiet Zone
National Radio Quiet Zone. The area in Maryland, Virginia and West
Virginia Bounded by
39°15' N on the north,
78°30' W on the east,
37°30' N on the south and
80°30' W on the west.
Before establishing an automatically controlled beacon in the National Radio Quiet Zone or before changing the transmitting frequency, transmitter power, antenna height or directivity, the station licensee must give written notification thereof to the Interference Office, National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944.
If you are unfamiliar with the National Radio Quiet Zone, there's a fascinating story behind it which is definitely worth reading about. A quick search will yield plenty of good info and articles.
The excerpts of US Title 47 CFR § 97 (Part 97) came from www.eCFR.gov and were current as of November 9, 2012.