I honestly think that during my time as a home SETI helper, internet,
that I have found atleast some signals. Not sure of origin, but they
were very regular.

I do think, that if we go to the Moon and Beyond, that we might look
into building a chain around the earth, out between us and Mars, that in
a globe formation, can be used to detect any possible danger to Earth,
from an Asteroid, Alien space craft, or other humans doing funny stuff. 

Mike
Alaska