The SETI project is trying to detect radio transmissions of aliens.
Assuming the ET have their own SETI using very similar technology to ours, are we sending data for them to receive?
If we are not sending data then it is very likely they are not sending either.
It is unrealistic to not send signals but to expect them to do the opposite.
Amateur radio can not exist when everyone is listening but nobody bother to transmit.
The question is about present and past attempts