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Even if our radio emissions have reached other inhabited systems, they would be well into the noise floor by that point. Unless some alien race has a probe rather close by that can still pick out the signals from background noise I don't imagine anyone/thing has detected us - at least not from just radio emissions.
Unless they've come up with some clever way to pull signals out of the noise floor that we've yet to discover - higher gain detectors don't help pull signals out of the noise, they just make the noise louder...
This is complete nonsense, just within 100 light years there are about 512 stars, not including white dwarf stars. Within 50 light years if we count just the ones visible to the naked eye from earth they number 133. I have been listening to Seth Shostak on the radio for many years now and he thinks we can detect artificial signals at more than 1000 light years even with our primitive technology. So do the Chinese with their worlds largest radio telescope they are just finishing. They even relocated 9000 people so they could build it there, paying them each the equivalent of $1500 or $1800 to relocate.
If you don't know who Seth Shostak is, he is an astronomer, currently the Senior Astronomer and Director of the Center for SETI Research.
Alan