Nick, we just use whatever sticks are in the area. It is best to cut a live one as opposed to a dead one from the ground. Doesn't matter if it has branches or not, but the best results actually come from a single limb with no branches. I highly recommend using a dark para-cord to run between the two trees, there are all sorts of ways to hang a stick vertically, so use whatever works best, but you can wrap the end of a stick with cable wire and just run the para cord through the loop.
If you're going to try this on RY, I'd recommend locating for a well used trail on the downwind side of one of those clear cuts, there are ALWAYS good trails along the edge. Find a spot that you can access and set-up further downwind of the stick. Run the paracord across the trail and situate the limb as close to the center of the trail as possible. You want the edge of the branch about waist high. Just use your boot to clear the ground under it...you can take a leak if you want, but not a critical step. We don't put any scents on the stick itself. Set a camera if you have one, I think you'll be surprised what you see.
Pop's heading back this week, maybe he'll make a video of setting one up and share?