Quote Originally Posted by coreying View Post
Yet there are many that haven't heard this...

Since the people that can hear it say that it is loud enough to be heard over the radio with the windows shut, if you turn off the radio (and maybe open the windows), is it loud enough to be recorded?
A good recording of the sound may make it easier to describe and get concensus from others that they are in fact hearing the same thing.
I've tried with a cheap video camera, but the microphone is rubbish. It either picks up too much wind noise from the open windows, or amplifies closer sounds. Whilst I can just distinguish the rattle on my recording, it's not convincing enough for skeptics.