Searches For Recurrence of The Signal
The signal was expected to appear three minutes apart in each of the horns, but this did not happen. Ehman unsuccessfully looked for recurrences of the signal using Big Ear in the months after the detection.
In 1987 and 1989, Robert Gray searched for the event using the META array at Oak Ridge Observatory, but did not re-detect it.
In a July 1995 test of signal detection software to be used in its upcoming Project Argus search, SETI League executive director H. Paul Shuch made several drift-scan observations of the 'Wow!' signal's coordinates with a 12 meter radio telescope at the National Radio Astronomy Observatory, Green Bank WV, also achieving a null result.
In 1995 and 1996, Gray also searched for the signal using the Very Large Array, which is significantly more sensitive than Big Ear.
Gray and Simon Ellingsen later searched for recurrences of the event in 1999 using the 26m radio telescope at the University of Tasmania's Mount Pleasant Radio Observatory. Six 14-hour observations were made at positions in the vicinity, but did not detect anything similar to the Wow! signal.
Read more about this topic: Wow! Signal
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