The very first voice and music transmission ever done on radio was by Canadian Reginald Fessenden way back in Dec. 1906. It was a milestone moment and the very first real "broadcast" that only those on boats at sea could hear. They were amazed because before that, it was only Morse Code. 

Where would that signal be now as it floated into space? Believe it or not, someone has done that calculation. Not that there's anyone out there, let alone someone with the right equipment to hear it. But Earth's radio broadcasts don't stop here and somewhere out there, some being could theoretically be listening. 

"The radio waves carrying Fessenden’s first broadcast have reached some of the closest stars. For example, they have reached the closest star, Proxima Centauri, at just 4.24 light-years away.

Would any beings at Proxima Centauri be hearing our music and voices? No. While our music, news, and television signals have passed through their skies, the broadcasts are so faint and scattered that they dissolve into cosmic noise, leaving only a whisper that a technological civilization once existed. So, assuming they were using technology similar to that we know, they would know something “artificial” was there. But they wouldn’t hear the exact content."

So in other words, exactly like DX-ing on Earth, where the station fades out the second they air the I.D! 

But hey, imagine if you could recover the signals from here. We could finally get a real aircheck of Al Boliska doing mornings on CHUM. It's the Holy Grail for Ontario collectors. Maybe someone out there has a tape recorder. If so, please contact Dale Patterson immediately!

Earth’s radio bubble marks how far our signals have traveled