Seems pretty unlikely that we are going to detect the transmissions of an alien race from Earth. Even if there were an alien race out there, for how long would it be emitting radio waves? 100 years, tops? We probably couldn't even recognize the radiation it was transmitting - presuming they were even transmitting radiation. Better chance the aliens would discover us before we discovered them. Plus, aren't these signals going to be so incredible weak that we wouldn't catch them anyway? Isn't this just a colossal waste of time?