The Green Bank Observatory is a radio observatory located in Green Bank, West Virginia. It has a number of current research telescopes and some historic telescopes. Its telescopes are single-dish (i.e., not arrays) but do participate in very-long-baseline interferometry observations. The observatory is surrounded by a radio quiet zone, a region where radio transmission is limited. The observatory was for a long time a facility of the NRAO, but in 2016 was separated, the NRAO focusing its efforts on newer projects. Among the telescopes:
Previously at the site was the Green Bank 300ft Telescope (GB300), the predecessor of the GBT.