I've killed two mature bucks on the ground in the last 2 year within 15 yards, both times had Ozone generator on tree at head level. I use the Zero Trace, they have been discontinued, but can still be bought for the CHEAP online.
"I have but one passion in my life, Mr. Rainsford, and it is the hunt. The world is made up of two classes - the hunters and the huntees."
