Arecibo Observatory Radio Telescope, National Astronomy And Ionosphere Center, Arecibo, Puerto Rico

The telescope also had military intelligence uses; among them, locating Soviet radar installations by detecting their signals bouncing off the Moon.
Arecibo is also the source of data for the SETI@home and Astropulse distributed computing projects put forward by the Space Sciences Laboratory at the University of California, Berkeley and was used for the SETI Institute's Project Phoenix observations.