On Sat, 04 Sep 2004 22:47:41 GMT, "Alfred A. Aburto Jr."
<aburto@sbcglobal.net> wrote:

Are they likely to broadcast in a manner that we could locate them or are
they more likely to only listen to the more primative modes of
communications that we are are using.

If they use energy as we do then they would be broadcasting ... probably not
intentionally though ...

Agreed, and this is the detection that is the real next step in SETI.
Currently/previously, we have been primarily searching for beacons,
which if life was common, we should have found at least a couple of
clear instances of in our half-century search. For the last decade,
and increasingly, we are modelling based upon our own technological
developement rate and projections. Within a decade, we should be able
to state with some certainty the likely average of level I civs and
above  that exist within our galaxy and pretty much through out the
immediate region of our galactic cluster.