Trim off rind and excess fat from ham; score fat in a diamond pattern. Place ham on a broiler pan sprayed with non-stick vegetable spray.
Combine remaining ingredients in a small saucepan over low heat, stirring with a whisk until well blended. Brush 1/3 of jelly mixture over ham.
Bake uncovered, at 425 degrees for 5 minutes. Turn down oven temperature to 325 degrees. Bake ham for an additional 45 minutes, basting with remaining jelly mixture every 15 minutes.
Transfer ham to a serving platter; let stand for 15 minutes before slicing.