Visitors to the site should help protect our observations by leaving all electronic devices at home. If you cannot do that, please disable all wireless signals on your mobile phones and other electronic devices. Going on a tour or a hike? Please power off your electronics completely and leave them in your vehicle when heading behind the gates. (How do I disable devices?)
Site staff and long-term visitors should follow all site RFI and safety regulations while on site, including use of only approved, diesel vehicles when down site. Detailed rules for the site can be found here.
The Green Bank Observatory site is broken into two protections zones, one for the laboratory, housing, and visitor facilities (Zone 2), and one for the Radio Astronomical Instruments themselves (Zone 1 aka the Radio Astronomy Instrument Zone), and the interference protection policies for the site are separated according to the zone. More details on the site zoning and regulations can be found here.