I'm not going to call anyone a liar because I have been proved wrong more than once before, but I would like to see that one before I believe it. Maybe for a water setup, but I can;t see that help much in a field setup.
I know for a fact that others on this site can attest to this when I say geese sometimes will not finish with a robo duck going in the spread. They will hit that 35-40 yard range and slide off to one side or the other rather than committing right in. There are always exceptions to the rule, but I like to keep the law of averages in my favor.
Back to question regarding hen vs. drake. I have and will use both. I like the hen more earlier in the season since most ducks don't have much plumage early in the year. But to play devil's advocate to my own answer, those drake spinners really stick out on those sunny days. That should make the decision about as clear as mud :mrgreen: