i am seeing the same problem on my land. Last year I got serious and learned to call at night with the lights and have had limited success. Ive called them in and they've been howling all around me at times but they've never committed, even with a decoy out. Now, granted i may have been doing something wrong but towards the end of the season, i set a bait pile. I was never able to hunt it but i had a cam on it & had them visiting all hours of the night & day. The bait consisted of dog food, eggs, chicken necks & backs, and sausage. Irresistable! I will be doing this again after the deer season.