3 C. sugar
 2 C. water
 6 C. orange juice, chilled
 6 C. grapefruit juice, chilled
 1 ½ C. limeaid, chilled (I added a little more, to taste)
 1 liter ginger ale, chilled

In a saucepan, bring sugar and water to a boil; cook for 5 minutes. Cover and refrigerate until cool.  Combine juices and sugar mixture; mix well. Just before serving, stir in ginger ale. Serve over ice.