Not long ago smoke and huge fires were the means of long distant signaling.
Why assume that we can detect any type advanced signaling?
Or any type advanced Space Crafts Drive systems?
We've barely scratched the Stealth surface in the last 50 years.
So detection based on our technology is like trying to detect a pebble thrown in the Red Sea from New York.
We probably have a better chance of actually doing that!
And if there is intellegent life out there?
They probably feel about as good about visiting us,
as I do about walking through Harlem after dark with a wad of money taped to my forehead.
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