Radio telescope

"On the night of August 15, 1977, a radio telescope the size of several football fields sat in a field outside Delaware, Ohio, listening to the sky."https://spacedaily.com/sd-in-1977-a-radio-telescope-in-ohio-called-big-ear-picked-up-a-72-second-signal-so-strong-and-so-cleanly-from-the-direction-of-sagittarius-that-the-astronomer-on-duty-circled-it-in-red-ink-and-wrote/