The round loop is a radio direction finder and is used for detecting radio transmissions and provide a rough estimate to what direction it came from. Several boats at sea at different locations could triangulate with some accuracy where the radio transmissions came from and home in. That is how they hunted U-boats at times.
Standard issue item on boats. Not a late war sensor.
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"Noch und Noch"
Prowling the Nord Atlantik with GWX 3.0.
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