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United States National Radio Quiet Zone
The United States National Radio Quiet Zone is a large area of land surrounding the National Radio Astronomy Observatory (NRAO) near Green Bank, West Virginia. It is a rectangle of land approximately 13,000 square miles in size and straddles the border of Virginia and West Virginia; it was picked because it has a unique topography that screens out most incoming radio signals, allowing the Green Bank telescopes to receive signals that are otherwise too quiet to be heard over the normal radio background.
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