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I circled the parts on the fuselage in red.

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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.

enter image description here

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It looks like a VHF and ELT antenna.

enter image description here

References:

  1. Boeing 737NG Radio Equipment

  2. Communications

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