To get baits started, we used to catch suckers during the spawn, slice then stem to stern, and throw them in a 55 gallon barrel to ferment. After they turned to a maggot soup, we shoveled a scoop full onto a 12" square of burlap, tie it off with a piece of wire, then go to the chosen spot, bend over a small sapling, tie it to the top branch, and let it go.
We also used a concoction of vanilla, anise, syrup, coolaid, etc and shot it up into the trees with a super soaker. I also used a small sprayer while in the stand to help get the scent out, and maybe help cover my scent.