When the air raid alarm sounded, Liu Xiangzhen did not return to the command bridge but instead walked to the porthole and raised his binoculars to look over at the "Nanjing" not far away.
At the top of the foremast, there was an object rotating, looking like a large winnowing basket.
That was an antenna.
However, it wasn't a radio antenna, and no radio antenna looked like that.
Yes, that was the radar's antenna!
That antenna would only rotate when it was working; otherwise, it was kept stationary.
For the sake of secrecy, as well as to deceive and mislead, only a few ships equipped with radar were not allowed to use it when entering or exiting ports. The antenna had to be fixed at a certain angle, then covered with a canvas hood, making it look like some device to scare and drive away birds from afar.
Moreover, the Navy had never disclosed any information related to radar.
