Place all ingredients in a soup kettle or Dutch oven. Slowly bring to a boil; reduce heat until mixture is just at a simmer. Simmer, uncovered, for 3-4 hours, skimming foam as necessary. , Set chicken aside until cool enough to handle. Remove meat from bones. Discard bones; save meat for another use. Strain broth, discarding vegetables and seasonings. Refrigerate for 8 hours or overnight. Skim fat from surface.