There should’ve been millions of inhabited planets and so many radio voices it would sound like static. Instead - nothing. Something doesn’t add up...
Part of the problem is that radio waves deform over distance. After a few dozen parsecs, they have deformed to the point where you could not listen to the amplitude or frequency modulation. Thus, they are pretty useless for interstellar communications. So if any interstellar civilization exist, they probably communicate using something different that is beyond our technology level. Thus, we would not hear them.