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

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

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

See What are these antenna-like protrusions for on an airliner? — , May 10 '22 at 10:50

score 2 · Answer 1 · answered May 10 '22 at 10:52

2

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

answered May 10 '22 at 10:52

RAC

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). – Sushi 777 May 10 '22 at 12:02
Comms info on the 737... scroll down for a diagram of the antennae placements on the fuselage. http://www.b737.org.uk/communications.htm – It Grunt May 10 '22 at 12:07

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