Place all ingredients in a stockpot. Bring to a boil. Reduce heat; cover and simmer 1-1/2 hours., Discard turkey carcass. Cool broth 1 hour. Strain through a cheesecloth-lined colander; discard vegetables and herbs. If using immediately, skim fat from broth; or refrigerate 8 hours or overnight, then remove fat from surface. Broth can be frozen up to 2-3 months.