Here would be a good example of a no crow collar and what it could sound like. I don't think I could ever use one. He does "crow" more in the video, but I've found a few marks so you can fast forward to those points to get a good idea.
11-12 second mark , 1:55 mark, 2:15 mark
How much space do you have - how many hens to rooster?
It appears you may be giving him the attention that he wants, even if it is throwing things at him. He has you trained to appear when he crows:) Give him something else to do beside look to you for entertainment. Rake up some leaves...