I used a B-Mobile and two hens last year. I set the B-Mobile facing to the side and two hens with one facing to the side and one facing away from me. the B-Mobile wasn't facing the hens at all. I had at first light a Tom come in and skirt right to the B-Mobile and when he was about ready to pounce he got the hammer. Same setup about 30 minutes later and had three Tom's come in and tried to get the B-Mobile and again same result. They were more interested in beating up the boy to get to the girls.