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Any civilization within a few dozen light-years of Earth -- having comparable technological capabilities -- could be detecting our artificially produced electromagnetic radiation right now. The major component would be from the radar of our defense systems, which pours out 2 billion watts in all directions.
But the dilemma is that our world is already growing fainter and harder to detect by extraterrestrials. We are rapidly moving into digital communications, cable and fiber optic transmission. Within 100 years Earth will be "radio quiet," save for defense radars.
Any nearby extraterrestrials would have to get extremely lucky to be able to find us in such a comparatively short window of time.
Originally posted by majestictwo
So says Ray Villard in an article in Discovery News.
This is a good article the problem is it appears based on like for like (comparable technologies) in other words civilisations are not hundreds of thousands of years more advanced than us. Its unlikely we would detect an advanced civilisation of this magnitude, on the other hand it would be likely they would detect us.