Yes! I live in the east central part of Ohio and I too have noticed this. At first I thought it was a car stereo but my animals act wierd too when this happens. They don't act wierd when a loud car stereo goes by. My 9 yr. old son said something about the rumble he heard 2 nights ago around 9:00 PM. I thought it might have to do with mining but as far as I know there is no active underground mining in my area right now. All I know is I have lived in this same house for almost 10 yrs. and never heard this before the last month. I posted something about this on another thread about 3 weeks ago. The guy that started that thread was from Wisconsin I think.