scout your hunting locations for sign first of all. Also if you plan on hunting fox stay away from any howling, as it will deter any fox. start with a few soft cottontail distress calls working up louder as you go every 5-10 min or so. then maybe try a howler, also howlers are good coyote locators, as usually 50% for the time they howl back giving you an aproximation of their location. Stay well concealed and very still, a little persistance an you have success! good luck