i always use a wick and i like to place mine as high as i can reach...
no real reason...
i dont like putting it on the ground or on trees or whatever to leave it out there(unless its going into a scrape or on a drag)
my thinking is i want to be there when they come smelling for my scent....
ive actually seen some success with scents since i started using fresh scent off a deer farm...always trying to learn more though...