Here's what I do,and it's paid off in the past.
I use discarded grease from a friend's small cafe/sandwich shop. Heat the grease up and mix in a small bottle of anise oil from the spice rack of the grocery store. Bear down here in the Southern Appalachians really relish the anise smell,and it travels FAR! Then soak a rag about the size of a kitchen towel in the hot grease/anise,tie it to a small piece of rope,tie this around your waist and drag it behind you for 2-3 miles through the woods starting and ending where you want to set up.Hang the rag on a bush and put out a couple pounds of dry cat food and pour a little of the oil on it.I like to set up on the edge of a small creek that runs away from where I dragged the grease soaked rag around and over the top of a mountain or two. Then along the creek edge where the water lapps,pour a quart or so of the grease where a little can get into the water along and along. The creek will take the smell down stream 2-3 miles,and any bear that smells it will probably come investigate. The thicker the setup area is with laurel or other bushes the better as long as you have a clear shot where you can put a ball through both lungs or in the brain which ain't a very big target to hit. You can also put a small can of the grease/anise on a sterno burner and let it boil while you're on the stand.I think this helps cover your scent,and the vapors/smell travels a long,long way. Be careful about setting the woods on fire with the boiling over grease,though!
You can use vanilla extract instead of anise,too.Everything that you can trap in the woods loves the smell of vanilla. In fact,the game and fish dept.trappers that I know use vanilla on about everything. Vanilla waffers will catch every coon in the woods :winking:.