440 x 378 x 105 according to information on Marantz website

of course yes

I can confirm the 11 cm and the thing with the antennas! In addition, the antennas would still be rotatable, so that the receiver is only 11cm high despite the antennas...

no.

Hello Reto. The 85 watts power refers to a resistor of 6 ohms. The 50 watts probably refers to 8 ohms or it is a mistake. In any case, the unit has enough power to drive all normal speakers without any problems. I am surprised myself at the ease with which it drives my Boston floorstanding speakers. A very good unit. Greetings from the Valais, Thomas.

There is internet radio and it is compatible with all streaming services, you don't really need DAB.

Good day, You can connect your TV directly to the Soundbar and have a better sound than with the built-in speakers of your TV. If you connect a Blueray / DVD player or game console directly to the TV, the sound from these sources will also come out of the Soundbar. You would only need the AV receiver (Marantz) if you have speakers without a built-in amplifier. I don't see how AV receiver and soundbar together would make sense. Kind regards

You can, but you shouldn't, because 5.1 signals need all the speakers and Audyssey calibration systems won't work. In my opinion, it is better to buy a quality stereo unit like the Marantz NR1200, and activate "Stereo downsampling" as output on the source.