Not really sure why this was killed, but it's absolutely true. From the moment we started making radio signals, we've been broadcasting our location. Every single time we communicate with our deep space probes, we're sending out very specific signals that we're here. To that end, that's the entire point of the opening scene in the movie Contact. It's just that the time frame we've been broadcasting is just a drop in the ocean of cosmological time, and the signals really haven't gone very far in comparison.