Topic moved to Small game, predator and trapping forum since it more accurately belongs in this forum and I believe you will get more responses in this forum. 1-week redirect notice left in original forum so OP and others interested in that forum can find moved topic.
CalHunter
Moderator

p.s. Check your state's game laws but they may allow you to use some type of distressed animal/bird call that "draws" more crows to your setup.