I finally found 2 extremely relevant articles after digging through my Stumble history.
The first one,
http://www.thesun.co.uk/sol/homepage...to-aliens.html, is about how satellites are cutting down/eliminating our radio waves that we send into space.
"Dr Frank Drake said transmission of signals into space was being cut by the digital revolution.
As a result, any little green men on other planets would not be able to detect them.
Dr Drake said Earth was surrounded by a 50 light year-wide "shell" of radiation from analogue TV, radio and radar transmissions. The signals had spread far enough to reach nearby star systems but are vanishing.
He explained that while old-style TV transmissions could generate one million watts, digital transmissions are much weaker."
This means, to me, that other advanced civilizations (who would likely use satellites in one form or another) may have reached this stage long ago. This would make them very hard to detect for us.
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