We had no idea what it was and did not speak of it for years.My wife and I were driving back from Green Bay Wi. approx 11:00 on a Saturday night.My wife was sleeping and I saw an object tree topm level following us from us 2. I thought it was a helicopter. I awakened my wife to tell her about it. We stoped the car on a knoll and looked back and the craft crossed the road heading back west. The craft had flashing lights around it and it made us stare in ah for a few minutes and then moved toward the west over a bog. We have told only friends in the last 10 years or so.((NUFORC Note: Witness indicates that the date of the incident is approximate. We have assigned above an arbitrary date in 1974. PD))