Space... is big. Really big. You just won't believe how vastly hugely mindbogglingly big it is...
My point is space is HUGE, and it would take a stupendous amount of effort and energy to create and send a signal which Earth can correctly receive. And that's even if you specifically focus it at us.
But why would anyone specifically focus it at us, if our own signals are not focused and quickly (quickly in term of universe distances) become indistinguishable from background radiation, how would they know we are here?
What I am ultimately claiming is that even if we have intelligent radio using alien life "near by" we still would never find each other. Because even if we both have a SETI equivalent, neither one of us would initiate the huge effort necessary to send a focused "Hello" signal which the other can receive.