You have to use more than one tactic to keep predators away. Predator proof the chicken house and run by burying poultry netting or other material around the outside. Make sure the top of the run is covered (if they will be in a run) and that there are no openings. Yes talk radio helps, but I think if you leave it on all night, predators will get used to it. Put the radio on a timer, or turn it on and off at varying times throughout the day and night if you want. We use motion sensor lights outside the barn too. There's also a motion activated sprinkler you can buy that's designed to repel predators, for wherever you have a need, including in the garden. It makes a noise when it's activated as well as spraying water. It's solar powered. It might also have a motion activated light on it. I've read that it works great, thinking of maybe getting one, as I think we could use it in several ways, including keeping deer off our young trees, as well as at the barn. Whatever you use, it's always best to rotate methods or introduce new ones once in a while