The furthest distance I have experienced is about 300 yards. Like Joel said I think a lot plays into it. Don't believe all this stuff about clothes and rubber boots. All of it works but only to a point not nearly as well as the claims. All you can do is take as many steps as you can to minimize your scent and impact on your hunting area. Your breath is the biggest cause of odor so what can we do stop breathing? When deer get close or down wind I make sure I breath through my nose and believe it or not it does help. OH YEA, Joel was right about the 485 yards that is the furthest I have heard as well. Out west I have heard about elk catching scent over 1000 yards away. Do the best we can and hope the deer gods smile on us that day.