I read about this set-up in Pa Game News back in the 70's, you prop up the sheet in front of you , cut reverse u in sheet so shotgun has access' if I recall they stated that it's best to have afew wounded crows screaming to add to the frenzy. I shot plenty of crows, never had them screech when on ground. They can sure run fast and duck for available cover. I've also had crows respond to any distress call. They changed the season in Ga it closes 2/28 as well as fox,bobcat,squirrel. Coyotes 24/7 except on state land, can't use electronic on state land and only for coyote. Fox, Bobcat manual/hand calls only. Let me know how it works for you.