I believe that ET's exist and they are closer than we think. How we locate them is another debate! I also believe that sifting through all the chaff to get to the wheat is very important and SETI is going the right way about this, but with all the amount of signals floating about in the universe makes things difficult. This includes our own radio waves that we have sent into space through TV and radio and the like.
ET!!! Now then we have so many idea's as though how they look, I guess we could easily overlook the fact that they look identical to us in every way, and are they all going to be friendly or forthcoming?