What is the radio quiet zone for the Green Bank observatory?

Related questions

1. How does radio astronomy work?
2. What is VLA?
3. What can microwave telescopes see?
4. What is the strongest telescope on Earth?
5. What problem do refractor telescopes have that reflectors do not?
6. Are there radio telescopes in space?
7. Why are most large telescopes reflecting telescopes?
8. How much did the Arecibo Observatory cost?
9. Do refractor telescopes use mirrors?
10. What is the VLA used for?

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8. #oversees
9. #radio
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12. #telescopes
13. #quiet
14. #communications
15. #created
16. #sugar