This event took place over 30 years ago.
My summer vacation was spent working on a farm.
At 3:00 p.m., on a Saturday afternoon, while waiting on a township road to be picked up by my mom & dad for ride home for the weekend, I heard a very strange sound, somewhat akin to the sonar on a submarine.
I looked around the area and to my amazement observed a gray disk about the size of a hood on a car, basket weaving between the high voltage power lines that were located by the road.
On seeing the object I became frightened and wasn't sure what to do.
I then put my head down on the mailbox and closed my eyes.
I heard a sharp distinctive sound, different from the first.
I raised my head and looked up to its original position and then scanned the area of the farm and saw it again.
It was directly over the peak of the farm house's roof.
On looking at it again, it appeared to be spinning on an axis of some type, wobbling slightly as it turned.
As I observed it, it took off in only what I could describe as an arc at a high rate of speed unlike anything I have ever seen.
Then after it was gone from sight there was a loud snap as if a gigantic rubber-band and been stretched until it broke.