It depends. Electromagnetic waves are strange things. Due to certain circumstances they can travel much greater distances than they normally would.
We're using radio telescopes to listen to everything from Binary Stars to super novas. Of course, all these events happend millions of years ago, and have a power output 1,000,000,000,000,000,000 times greater than any TV signal man has ever broadcasted.
In millions of years if someone with the right equipment was paying attention, and exactly the right conditions existed...they might detect our first TV signals.
I wonder what they'll make of I love lucy.