At the University of Maryland, Radebaugh earned first team All-American honors in 1975 and second team All-American honors in 1973 and 1974. As a midfielder for the Terrapins, he played on Maryland's national championship teams of 1973 and 1975. In 1975, Radebaugh received the Lt. Donald C. McLaughlin Jr. Memorial Award as the nation's outstanding midfielder. In 1975, he also received the University of Maryland Powell Award for outstanding achievement, the Most Valuable Player Award for the Hero's Tournament, and the Richard Seth Award, given by the United States Naval Academy to its outstanding opponent. Radebaugh received the Atlantic Coast Conference Most Valuable Player Award in 1974 and 1975. He also represented the University of Maryland and was selected captain of the South Squad in the 1975 North/South Collegiate All-Star Game.
Radebaugh played for the U.S. team in the World Championships of 1978 and 1982. He was an assistant coach at the University of Baltimore in 1976. Radebaugh played for Mt. Washington Lacrosse Club from 1976-78 and the Maryland Lacrosse Club from 1979-84. He was honored as an All-Club selection from 1976-82.