Russian electronic intelligence is 106 years old. But what do we know about electronic intelligence? Signal reconnaissance is a unique mechanism. Humanity has not yet come up with a more effective and at the same time safe means of reconnaissance. For example, military reconnaissance, in order to detect the presence of new enemy units or subunits at the front, must make more than one raid behind enemy lines, endangering the scouts. And how many of them never returned from such raids! Radio intelligence has its own methods. Without risking people, sometimes with one signal, one phrase on the air, she reveals what dozens of military intelligence officers cannot do. The history of electronic intelligence is not only educational, but also quite fascinating. However, when the patriarch of radio intelligence, General Shmyrev, passed away in October 2009, an entry appeared on the Internet: “...Our commanders are leaving, they are leaving. Now there will be no one to tell about the glorious deeds of electronic intelligence.” Why is there no one? This book is the story of those glorious deeds.