The 20-meter diameter telescope at the Green Bank Observatory (NRAO) in Green Bank, WV, was constructed by RSI and completed in late 1994.
Originally funded by the US Naval Observatory (USNO), it was part of the National Earth Orientation Service (NEOS) telescope network, and part of the USNO Navy Network (NAVNET) participating in a global program of Earth Orientation VLBI measurements in cooperation with the International Earth Rotation Service (IERS), and with the NASA Space Geodesy program.
The 20-meter program was shut down in June 2000, due to budget cutbacks at USNO. In 2010, the National Science Foundation awarded a $1.8 million grant to the University of North Carolina - Chapel Hill and Green Bank to expand the Skynet Robotic Telescope Network. The 20m has been restored, automated, and made accessible via the Skynet website.