Hi mate.
Crows wont decoy to pigeon decoys but they may be less spooked!
Go get yourself 4 crow decoys and a call def the best way.
Have had good bags with mine.
After you shoot a few peg them out as well ( have put some out with the wings 'open' think it works on occasions!)
You can also put a rabbit in amongst the 4 deeks looks then as if they are feeding!
Just make sure your hide and clothing, gloves and a face veil, is spot on tho cos they are much easier to spook than pigeons!