Male Cat Spraying in the House?

We adopted a rescue cat when he was an 8 week old kitten and he has been a great cat. We have 2 others, in total we have 2 males and 1 female cat. They are 15yrs, 10yrs, and 5yrs in age. When Tank was a kitten we had him neutered, just the like other male cat, and the female is spayed. They all get along and on occasion the male cats with get into a scuffle, but get over it quick. We do live in the woods and they spend time outside.

When we go to bed or leave for work for the day, we call the cats into the house like dogs and they respond well. What I am saying is that Tank behaves and we have no issues with him except for the fact that he sprays everywhere in the house. He also sprays all over the place outside, which is what we wish he would only do outside.

We have tried everything and we always clean it up and he goes right back to the area and sprays again. I have tired the aromatherapy, collars, candles, etc. that everyone swore worked and it did nothing. He sprays even if there are no cats around outside. He has been to the vet and he never had an urinary track infection or any other problems. He is healthy and physically active. We do not want to get rid of the cat being he is like one of us in the family, but I am running out of options and it is not healthy for the cat or us humans in the house. Other than maybe keeping him outside all the time ~ what else is their to do?