Although it is technically a radio telescope for astronomy and radar ranging, the Arecibo Observatory has been used for Messaging for Extra-Terrestrial Intelligence (). How many total hours has Arecibo been used to transmit a signal?

If your reference source distinguishes between METI, radar, and/or other types of transmissions, please include this information in your answer.

Related: Does man send any signal to attract aliens?

  • $\begingroup$ In case you are also interested in messages sent by other telescopes, this article might be interesting: newscientist.com/article/… $\endgroup$ – samcarter Jul 23 at 12:39

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