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I've searched for an answer to this question on this site and others:

What is the purpose of the small vertical dorsal fin about halfway along the fuselage of the Boeing 737?

See the attached image where I have included an arrow pointing to the small fin.enter image description here

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It's the antenna for the Left VHF communications radio - the ones for the Centre and Right radios can be seen under the fuselage.

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  • $\begingroup$ Many thanks for the reply. I have long wondered what they were (I once thought they might have served an aerodynamic efficiency purpose similar to the strakes seen on engine cowlings). $\endgroup$
    – Sushi 777
    May 10 at 12:02
  • $\begingroup$ Comms info on the 737... scroll down for a diagram of the antennae placements on the fuselage. b737.org.uk/communications.htm $\endgroup$
    – It Grunt
    May 10 at 12:07

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