For nearly a hundred years, Earth has sent radio signals into space. If anyone nearby is listening, they probably know we’re here. In light of this, a new ...

Well, it's true that there aren't easy resources for SETI researchers to mount major transmitting projects today. But of course, this says nothing about what the aliens might choose to do.

THE transmitting aerial of a broadcasting station designed for local or national service should confine as much as possible of its radiated energy to the horizontal direction, emitting as little ...