What result of the Drake's equation?It can be million or two civilizations, for all what we know.

And for what evidence are you looking?I think that our current or even near future technology is absolutely unable to find any evidence of alien civilizations unless they build some more ineffective Dyson type constructions.Simply,I think as an average human cannot see quasars in the nightsky without big telescopes as we haven't got as good vision as these telescopes but it doesn't mean that they (quasars [aliens]) don't exist.