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enter image description here
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Above you can see a small fixed (?) part on the Embraer 190, just above the KLM logo. It is on both sides of the tail. What is the function of this part?

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That is almost certainly a navigation antenna.

From the E190 AOM (Airplane Operations Manual):

enter image description here

You can see the VOR2/LOC2 antenna rather more clearly in this photo:

enter image description here

(The VOR1/LOC1 and VOR3 antennae are embedded within the tailfin.)

Similar nav antennae are used on many smaller aircraft such as (more modern) light aircraft, utility aircraft, business jets and some regional jets.

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