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There is a long straight component with three attachment points below the fuselage of the Fokker F28 Fellowship:

F28
(image modified from Wikimedia)

It looks like it is installed on both sides of the fuselage:

F28 (image modified from Wikimedia)

What is this component used for?

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    $\begingroup$ Possibly an ADF sense antenna? $\endgroup$
    – Boeing787
    Commented Jul 23, 2023 at 17:42

1 Answer 1

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those are antenna supports, probably for a radio navigation system, that hold the thin antenna rod in a straight line and keep it from vibrating in flight.

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