The small round grey/white Federal units in use today around the country are pretty much useless beyond a mile. On a good clear day, I can hear one about 3 miles away if I'm outside.
When they cranked up the big Chrysler units like the one on 53's quarters, there was no doubt about hearing them. They'd rattle the walls. Ten minutes after they shut down you could still hear them winding down. They were like a 'Q' on mega-steroids.
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