unknown puzzle again

[Snautzer01]

why the markings?

Foto WK II Lufwaffe Nachtjagdgeschwader Pilot im Flugzeug NAG 3 #96 | eBay

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[Capt. Vick]

I believe they where some kind of metal strips adhered to the plexi-dome, and not painted on markings. Some kind of direction finder or some such kit. IIRC

 

[Snautzer01]

I believe they where some kind of metal strips adhered to the plexi-dome, and not painted on markings. Some kind of direction finder or some such kit. IIRC

Picture is from a series depicting NAG 3

 

[Snautzer01]

Callin' Wurger

 

[vikingBerserker]

Is that a Fw-189?

 

[Snautzer01]

Is that a Fw-189?

Yup.

 

[CATCH 22]

I believe they where some kind of metal strips adhered to the plexi-dome, and not painted on markings. Some kind of direction finder or some such kit. IIRC

You are right: this is the Peilgerät-antenna PeilG 4. The middle part is rotating in the same manner as the big loop-antenna on some a/c. The photo below is a PeilG used on Bf 109E night fighter as well, and is the same as on the Fw-189 photo:

As per the German description the stripes are an additional antenna (Hilfsantenne).
If you remember the big Peilgerät on Ju-88, it's basically the same:

Cheers!
P.S. Some seasons ago there was a discussion in the modeller's-section about a Bf 109E night fighter and I was searching for some more details, finding the above ones. There is also a PE-part manufactured by AML, representing this particular antenna:

 

[vikingBerserker]

I had no idea they were used as night fighters, thanks!

 

[CATCH 22]

I had no idea they were used as night fighters, thanks!

Check 10./NJG 1 for example. Older D-variant was also used in the same role.
Cheers!
P.S. I remembered a "fun-factor" as well. Many years ago I was checking photos of Bf-109E-Trop from several sources and found a "misterious one" from JG.27 in Sicily. The a/c had a"wart" under the belly and I didn't know what it is. Later on I came to the information about the PeilG and the night fighters. The "White 12" was one of them, but with no night use. You still can see the stripes of the PeilG 4 though: