the several crafts were seen in the sky for several nights at 10:13 pm til 10:28 pm by several people at approx. 1500 ft. At the end of the weeks seen one craft was seen over a trailer park that made the lights on all the trailers blink and the people heard a humming sound. This was 200 meters from my house. I did not hear anything. One resident called as it happened to see if I heard anything. I did not. A few days later my two friends that have seen the crafts several times as I did were going down a country road at about 10:30 pm and noticed a light to our left possibly following us. I would stop the car and the craft stopped. This happened several times. This time the craft was about 200 feet above the ground and 150 feet to our left. It was summer of 1973. We had our windows down and heard nothing. I pulled into a farm field entrance toward the craft and stopped. It did not move but kept pulsating. We decided to drive back to my place and get the telescope we in hope of seeing the crafts in the past few weeks. I backed out and headed north toward my place, it followed. I pulled into the drive and ran in the front door, grabbed the scope and out the back door. The only chance was to see it as the light binked on. I got in view and seen a grey surface with no windows. It kept going toward town. Speeding up until it was over the Federal Prison at this time it went straight up into space in about 3-4 seconds. The strange thing about the movement was that the craft did not move as a car that you can see. The craft was only visible as the light was on and did not move while the light was on. The light would go off and come back on in another location and so on. The faster the blink the faster the craft traveled.