This apparatus was called the Ringtrichterrichtungshoerer (or RRH) translates literally as "ring funnel direction hearer", or more accurately: "ring-horn acoustic direction detector".
The RRH could detect targets at distances from 5 to 12 km, depending on weather conditions, operator skill, and the size of the target formation. It gave a directional accuracy of about 2 degrees.
It had a crew of three - traverse aimer on the left seat, elevation aimer on the right seat and a dial-reader/talker in the middle. The rolled-up material above the operators' heads could be unfurled to provide shelter.
The curved things visible under the ring are the rear of the horns.
your photo shows it on its transport cart
piet