RE: Elk hunting ??
I think you will find very few people elk hunting out of treestand. If you have a place for such, consider yourself lucky. I actually killed a bull out of a treestand last year. I cow called mostly, but bugled just to see if I could get anything stirred up. I have actually cow called in several cows to my stand, this bull just happened to be following a hot cow up the hill right into me.
Bowhunting elk, you usually cover lots of ground and get after them. Opinions will be a dime a dozen as far as cow call only, bugle only, do both.