Hello. I was at Prague yesterday, waiting for a connecting flight, and noticed a Swiss Air Airbus 319 with an unusual antenna housing towards the rear of the aircraft, on the top, and between the two normal VHF antenna. It was fairly long and low and unpainted - I assume it is housing a microwave array of some kind. You can see it in this picture online
here. What is it's purpose? ACARS? Passenger telecoms?
Thanks,
Paul