My coop is about 100 ft from the house and I can hear Dexter plainly, though somehow I have just incorporated it into the background noise and I don't really hear him at all unless I'm listening for him. I work shift work and don't even notice him if I'm sleeping unless he sounds distressed. My neighbors live about 100 yards away from the coop (I'm in the country) and they tell me they hear him occasionally but enjoy the sound. However, I've noticed that if I listen for him I can hear him from my parents' house (based on who has chickens and who doesn't and where the sound is coming from) and they're about 1 mile away as the crow flies. Of course, he's very polite and never seems to start before 0600 or so (unless I'm just oblivious until then!)