# Which horn saw it, and what does the single-horn detection mean? · Wow! signal > Three answers have been proposed. None is ahead on the evidence yet. Three are still possible. Source: https://mysteriesdept.com/mysteries/wow-signal/questions/QST0CXZ4PBT6QN1/which-horn-saw-it-and-what-does-the-single-horn-detection Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-26T11:59:08+00:00 --- **0** # Which horn saw it, and what does the single-horn detection mean? Asked 26 Oct 2026 by [**apollo** ](https://mysteriesdept.com/u/apollo)·Part of [What produced the Wow! signal?](https://mysteriesdept.com/mysteries/wow-signal/questions/QST0CXZ4P403VSY/what-produced-the-wow-signal)·3 answers·0·0 following **Three answers, none ahead** None is ahead yet. See what would settle it. ## Where it stands Three answers have been proposed. None is ahead on the evidence yet. Three are still possible. ## Why it matters The two horns give two candidate positions three minutes apart, and the absence of the signal in the second horn means the source turned on or off within about three minutes⁠[[1]](https://mysteriesdept.com/sources/SRC0CXZ4CKA0F1B/the-big-ear-wow-signal-30th-anniversary-report). Every follow-up has had to cover both positions, and every hypothesis has to explain the switch. ## Answers 3 [**None of these.** ](https://mysteriesdept.com/mysteries/wow-signal/answers/ANS0CXZ4WYR16BB/none-of-these) Not tested enough to call either way Evidence: none yet Still possible [**The negative (west) horn saw it; the source is at RA 19h28m.** ](https://mysteriesdept.com/mysteries/wow-signal/answers/ANS0CXZ4WPY4EWY/the-negative-west-horn-saw-it-the-source-is-at-ra-19h28m) Not tested enough to call either way Evidence: none yet Still possible [**The positive (east) horn saw it; the source is at RA 19h25m.** ](https://mysteriesdept.com/mysteries/wow-signal/answers/ANS0CXZ4W7A5HDS/the-positive-east-horn-saw-it-the-source-is-at-ra-19h25m) Not tested enough to call either way Evidence: 1 for Still possible ## History 1. 2010[Ehman puts forward: the positive (east) horn saw it; the source is at RA 19h25m.](https://mysteriesdept.com/sources/SRC0CXZ4CKA0F1B/the-big-ear-wow-signal-30th-anniversary-report) 1. 2010[Ehman puts forward: the negative (west) horn saw it; the source is at RA 19h28m.](https://mysteriesdept.com/sources/SRC0CXZ4CKA0F1B/the-big-ear-wow-signal-30th-anniversary-report) 1. 2025[Méndez et al.: the 2025 reanalysis narrows the two fields to RA 19h25m02s or 19h27m55s but cannot choose between them.](https://mysteriesdept.com/sources/SRC0CXZ4DAR1PCY/arecibo-wow-ii-revised-properties-of-the-wow-signal-from)For: The positive (east) horn saw it; the source is at RA 19h25m. 1. 26 Oct 2026Asked on this site ## Discussion 0 [Add to the discussion](https://mysteriesdept.com/signin?next=/mysteries/wow-signal/questions/QST0CXZ4PBT6QN1/which-horn-saw-it-and-what-does-the-single-horn-detection%23discussion) Help with this question [ **Propose an answer** Something the evidence could support or rule out ] [ **Propose an answer** Something the evidence could support or rule out ](https://mysteriesdept.com/signin?next=/mysteries/wow-signal/questions/QST0CXZ4PBT6QN1/which-horn-saw-it-and-what-does-the-single-horn-detection%23add-answer) [ **Add evidence** A result for or against an answer ] [ **Add evidence** A result for or against an answer ](https://mysteriesdept.com/signin?next=/mysteries/wow-signal/questions/QST0CXZ4PBT6QN1/which-horn-saw-it-and-what-does-the-single-horn-detection%23add-evidence) [ **Ask a sub-question** A smaller question that would help settle this one ] [ **Ask a sub-question** A smaller question that would help settle this one ](https://mysteriesdept.com/signin?next=/mysteries/wow-signal/questions/QST0CXZ4PBT6QN1/which-horn-saw-it-and-what-does-the-single-horn-detection%23add-question) [ **Add a source** A paper, archive record or image ] [ **Add a source** A paper, archive record or image ](https://mysteriesdept.com/signin?next=/mysteries/wow-signal/questions/QST0CXZ4PBT6QN1/which-horn-saw-it-and-what-does-the-single-horn-detection%23add-source) Where it fits Wow! signal [**What produced the Wow! signal?** ](https://mysteriesdept.com/mysteries/wow-signal/questions/QST0CXZ4P403VSY/what-produced-the-wow-signal)Key question · 5 answers, inconclusive [What does the rest of the Ohio SETI archive say about the signal's statistical company?](https://mysteriesdept.com/mysteries/wow-signal/questions/QST0CXZ4PVE087H/what-does-the-rest-of-the-ohio-seti-archive-say-about-the)Most likely · the Wow! signal is unique in the archive in strength and shape **Which horn saw it, and what does the single-horn detection mean?** You're here · 3 answers, inconclusive [ Ask a question under this one ]