UFO over Oil City, PA 1975

It was either late April or early May of 1975, when I heard a loud humming sound (much like that of a generator) outside our house on ((deleted)) Colbert Ave. I looked out our bedroom window on the second floor, that faced Colbert Ave., and saw a saucer type object about 75 - 100 feet above the house directly over Colbert Ave. A red pick-up truck (Ford or Chevy) either a late 60's or early 70's model was stopped in the street in front of our house. The man in the truck had one arm and this head outside the truck window and was looking up at the saucer. My younger brother got up at this time and looked out the window beside the one I was looking out, and also saw the saucer. The saucer stayed in place for about 30 sec. to a minute, then took off across the Allegheny river and over a Quaker State tank/drum on top of the hill, within a second. We tried to wake our mother up, but see told us to go back to sleep. The next morning we asked other kids on the block if they saw anything, no one did. The saucer looked about 30 feet long and about 15-20 feet high. It appeared to be made of a silver metal, with a dark gray circle around it. Appeared to be a large window (very dark) just above the ring around the saucer. Their were lights on the top and bottom of the saucer that were yellowish/white and they pulsated (may have been causing humming sound). I was 11 years old at the time, and my brother was 9. This vision has always been very clear, and I have never seen another since.
Date is approximate.  PD