Free speculative fiction online
I have found many stories that I read in High School 1951 -1955
I think technological civilizations are exceedingly rare and they don’t stay around forever. If you think of the “keyhole” events are own race went through to reach this point, realize we have been on the cusp of our own technology destroying us, and how long complex life took to develop; I can see technological civilizations separated by 10s of thousands of light years making any sort of interaction impossible. Probability may hint that we are the earliest possible anyway (2nd generation star system with heavy elements, time to develop complex life etc). I think we should be looking for sophisticated propulsion systems (on the order of solar energy releases) to find other tehnological civilizations. Radio signals just don’t cut it. We should keep looking though.