all of the suggestions here are good - and they generally don't work. we spent years and countless dollars on this effort, and in the end reintroducing game birds was a bust. we did have occassional coveys that would winter over, and once in a while a pheasant or two would hold out, but in the scheme of things we were never able to get anything like a sustainable, wild population. for reference, this was on approximately 250 acres of intensively managed land (feed plots, native cover, etc.) in a rural setting with surrounding farm ground. not to rain on anyone's parade, but we had the land and spent the money to make it go... and after about 7 years decided it was easier to raise them in the pen and release them before a hunt. (fyi... i was an assistant to a millionaire sportsman who funded this effort. we even had a full-time resident game manager. this was a serious effort!)
now, maybe Ohio is not the place to do this... but if anyone wants to ask about specific efforts, go ahead. seems like we tried just about everything!
good luck... and if it works i am thrilled for you. just offering the benefit of my experiences.