This is incorrect. Those signals aren't strong enough to go that far. Even SETI signals have been shown to be terrible means for interstellar communication.
TV/Radio signals were never intended for communication with aliens. Aliens have been comming to earth way before mass communication signals. They didn't need that to locate us. Any telescope capable of detecting a oxygen atmosphere could find us.
Aliens became highly interested in us the moment we started splitting the atom and blowing shit up. There are other reasons they are curious about us but are ability to fuck shit up is what they are worried about the most.