I use an owl,five or six crow decoys and crows fighting an owl call to start with. I switch to a crow desth call for minute or two that will get attention and sometimes I will tie a dead crow up at the feet of the owl decoy, using an owl crow fight call and a death call. That really [beeep] the crows off!
Of course I use cammo, cover my hands and face 12ga choked Mod 11/4oz of 71/2 or 6's works great. It's alot of fun!