Very bright, fast moving light which appeared to circle the local radio tower and speed away

I was sitting on my Dad's back porch with a work buddy around 10 pm when we both noticed a bright light moving steadily across the sky from the north towards town.  The light then accellerated very quickly past the radio tower and made a "checkmark" turn back to the NW at a very high rate of speed.  There was no sound comming from that direction.  The object was about 2 miles away (guess).  We were both shocked and ran inside.  I immediately called the Sheriff's office to see if anyone else reported it.  They had not received any calls at that time (within 3 minutes of viewing).  Dates given are questionable as it was so long ago.