100mileswest Of Milwakee radar-visual unidentified-object report — January 1968

On or during January 1968, at or near 100mileswest Of Milwakee, Wisconsin, United States, the source reports the following sequence: : Observer sighted an object that a baseball is thrown, more and blue white on the tail. The object disappeared after 3-4 seconds angle in the sky. The object shortly after which the object did disappear turned on the airplane's radar but no contrail.