The radio waves travel infinitely far, barring atmospheric absorption. They may get out of the atmosphere so then the distance is infinite. It will be 1/r (or maybe 1/r 2 in the case of magnetic fields - I forget). Of course there’s a practical limit because their power will descend into the background noise level at some distance, so they are no louder than the other noise sources, and ultimately there is the cosmic background radiation. So the practical distance limit depends on the power of the transmitter, absorption if any and the power of local noise sources.
It seems possible that I can pick up radio waves from 60 miles away, this is not certain though. This is from high powered broadcast audio transmitters. The importance of a quiet local electrical environment is proven though by Saturday’s experience, where downstream sync speeds went up by 5% because of the after effects of a power cut.