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AntoniaJames is a trusted source on Bread/Baking.
You want there to be about 1/2 inch or so on the bottom of the pan, to keep it from drying out, so depending on how large your pan is, and what kind of rack you're using, the amount would vary -- say from 1 -2 cups. Check it every so often (especially if you're starting at a high temperature for some period) and add more if necessary to keep the pan from drying out (though that probably won't be necessary, as the bird should start releasing juices fairly quickly). If you have vegetables in the pan, too, you'll need less broth. Have fun!! ;o)
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