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2$\begingroup$ related: What are the names of the antennas which I have marked in this picture of a Boeing 737?. I though there was already questions about those specific antenna on the B737 here but it seems other questions were about other antenna. $\endgroup$– Manu HAug 10, 2020 at 7:58
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1$\begingroup$ they're for when you're going sideways really, really fast! $\endgroup$– FattieAug 10, 2020 at 12:44
2 Answers
In general, those are called blade antennas. They consist of a monopole antenna (a single rod sticking out of the fuselage) with an aerodynamic fairing around it.