I live in a city with air force aircraft (ranging from small trainers to C-5s), Army helicopters, and commercial and civil aircraft.
(and godammit, they all seem to want to fly over my house!)
I've heard police R-44s and EMS AirLife helicopters that were so far away I've actually need binoculars to spot them. But I could still hear them decently.
I've also seen, but not heard, C-5s and C-17s until they're right on top of me.
As for how far you can hear an aircraft, I think it probably has more to do with air and weather conditions or the terrain the aircraft is flying over than anything else.
Oh, that sterotypical Huey "whop-whop"? That's also characteristic of just about every twin-blade helicopter. Again, air movement and suchlike is involved.
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