re: Best trick for bringing in hung up birds

Got to switch up what you're saying to him. I always viewed loud yelps as "hey, i'm here is anybody out there?". It would sound weird to just keep repeating that over and over again. If he's coming he's interested and knows exactly where you are, so you can stop that line and move onto something more enticing and softer, purrs etc. If he can't see you, you can try scratching on the ground like you are feeding and are too good to walk over to him. This is like saying "come over here and buy me a drink".

Remember it's a conversation, and no one wants to hang out with the creepy kid who says "hey, hey, hey, hey, hey" constantly. He's probably some dude in camo with a shotgun.

Generally just call less and quieter as long as he is coming to you.