Beacons vs. eavesdropping
The vast majority of SETI searches have primarily been focused on INTENTIONAL BEACONS not eavesdropping on directed signals tens of dB below and 'encrypted' by approaching the Shannon limit.
Space/Science » in reply to ETIs or Noise?
The vast majority of SETI searches have primarily been focused on INTENTIONAL BEACONS not eavesdropping on directed signals tens of dB below and 'encrypted' by approaching the Shannon limit.