I must be missing something but why seti people are trying to find e.t. life by detecting radio waves? What I know about radio waves is that they stop and/or reflect at pretty much any obstacles there is (including atmosphere). Not only that, we are barely able to detect astronomical radio sources like supernovas and quasars which are emitting stupendous powers compared to any man made radio sources. Radio waves also decay like other forms of waves, right? And even more the star of solar system can emit more radio waves than any artificial sources, masking out them. Why do we then think we could detect artificial radio waves from other stars?