It’s very far away- radio pollution doesn’t really travel that far before it’s lost in the background noise. When SETI and the like look for signals, they’re really looking for aimed signals rather than pollution.
There’s a couple of other considerations. Possibility of other, less indiscriminate communication methods, which is often tied to the idea that maybe there’s a point where you start to look at unfettered radio pollution as a combination of spam, littering, and declaring your existance, naivety and lack of general progress to the universe. “Here we are, we’re puny AND we’re annoying, come at us!”
If you’re a Humungous Radio Space Jelly or whatever maybe having constant The Apprentice beamed at you is enough to say 1) Don’t speak to these guys and then maybe 2) Oh cool, they have an oort cloud, let’s shoot comets at them til they shut up. And if you’re an aggressive hegemonising swarm, all that rf is probably a nice appetiser as well as a beacon