Use #11/2 coils. Dig a 3' diameter hole about a foot deep. place bait & fox gland lure in hole. Spray fox urine in back of hole. Use dry dirt collected during summer so won't freeze. Put a couple cotton balls under pan so dirt doesn't get under pan & prevent trap from going off.
Location: old farm roads, pastures, hayfields, along drainage ditches, railroad tracks, etc.