instead of hunting for it, why not send it out there and see what happens?
Load up several extra-solar rockets with some hearty organisms that can survive in extreme conditions. Program the recon devices to detect hospitible atmospheres/planets so that when the rockets fly by they can alter their paths to drop their payload when they find a suitable location. These locations will be far beyod the reach of our radio signals, so we’ll just have to throw this out there for posterity. Oh, and yes, include in the payload some information in various forms (pictures, mathematics, sound, the genomes) about planet earth.
This might be a faster, more efficient method of finding out if life outside of our planet is feasible.
just a thought.