Yes ,you can call from a treestand.
The distance between stands varies with terrain ,For woods hunting i move 3-500 yds.Moreso for open country.
I use a crappie reel [small plastic fishing reel] with 100' of spider wire line on it and a homemade decoy [squirrel skin/rabbit/bird wings].I alligator clip it to the top of a small 4-5' tree/bush and shake it vigorously inbetween calling.
I have many predator calls and swear by the burnham bros mini-blaster.
"I" wouldn't start out calling loudly because you can easily 'blow a predator out' ,i've started calling a few times and heard a coyote running towards me in the woods after i finished my first breath.
You can make whimpy none threatening howls with the mini-blaster ,make them sound lonesome by tapering off slowly at the end.
A diapham turkey call makes great hurt pup sounds ,hurrrt hurt hurt hurt sounds on the call after a couple of lone howls.
Coyotes in areas with cover use cover to approach you 4 out of 5 times ,they will come across open pasture if they're young and dumb or starving.
Also stay on stand an hour if your in a stand, you probably dont have 20 calling locations anyway.I've sat on stand after giving up on a predator coming in and spot a coyote slowly searching the woods.
One of the main things that seem to be hard for a new guy to grasp is where and how to set-up.
Imagine diverse land with open -not so open and wooded areas<[east tx].You'll want to approach either from downwind or crosswind to the edge of cover a coyote will feel safe in ,not too thick ,but with some shooting lanes.
Have your back to the open area with the wind in your face if possible.
Look for depressions or heavy cover leading your way and have your gun trained in that direction [ you have now forced the coyote to expose himself in the wide open to get downwind of you<< he has to come out in the wide open to get a smell ].He's not leaving unless he smells or sees you !!
Sometimes they do backside you but thats part of it or sometimes called a calling partner. [img]/ubbthreads/images/graemlins/grin.gif[/img]
If you see a coyote move so slowly it is painful and wait for him to go behind some brush to make slightly bigger movements.If he is stopped and looking your way do not move a muscle.
From the ground you have to stay ahead of him in the game ,when you see that he is in range bark ''whoop-whoop'' at him he'll stop for a second usually that is your window of opportunity .
So head on out with your bits of advice and let a few coyotes make a fool of you and get addicted to coyote hunting
just like the rest of us callers did !! [img]/ubbthreads/images/graemlins/smirk.gif[/img]
These are the basics of coyote hunting just common sense really but extremely important .. Best of luck Mike