I have a good friend that comes up from Tenn. to crow hunt just about every year. He is real serious about it. We build blinds and all kinds of stuff. I go out and scout before he gets here so we can be in there flight path, seems you can kill more numbers that way. He's got a home made caller, uses two big stadium speakers, car amp, 12V battery and MP3 player I think sometimes we can call crows from 2 or 3 counties. location and being hidden is extremely important as is decoy placement etc.