I set out about 7 dozen teal, but don't think you need teal specific dekes at all. I find teal to be, well, pretty stupid. (talkin' early teal). My experience with them is they are either here, or they ain't - you either limit in usually 5 minutes.....or don't see any. IF they are around, I think a rig of any decoys would work.
I use only teal moreso because over the 3 decades I've been hunting, I've ammassed a lot of gear, and simply have the teal dekes to use. Much easier hauling 7 dozen little dekes around than hauling the big dekes. If I were a purist, I'd use only my hen teal dekes.
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I just do it.......Duckin' Crazy!
They say there is "a fine line between genious and insanity". That's the line I live on.