@muellerwhh@jni@vicgrinberg Among the problems with "Three Body" and "Dark Forest"; Liu Cixin did not inform himself that well about how people do radar astronomy and radio astronomy or about how people have imagined SETI over the past 60 years now.
In the scenario he set up; any of a long list of current radio telescopes (military as well as civilian) could be set to track the galactic plane at any time and run hot, ready to transmit within seconds - and some of them would be.