When hunting large tracts of farm or land place the call behind you..Aim it down wind. you post 100,200, 250 yards down wind of the speaker. then sit cross wind of the direct sound beam or the person calling....Read the land to know which side of the main sound beam to post. Best to put interference on the side your shooting on...Rock pile, ranch house etc..Something that makes the animal make the arc on the opposite side of where your posting...This is great for coyotes........They sure are not going to make their 200-250 yard arc into a ranch house..
However when you call small tracts of land..Maybe an area that you can only see and acre in front of you....Maybe the ole horeshoe or the U set up...Tree line and building on three sides open area at your back. Put the speaker in front of you and aim it down wind...place the speaker in a bush, tree etc that is half of the acre.. Now this is the time for you to sit 1/2 acre behind the speaker..Not in line with the wind but to the right or left.
See what you want the coyote or fox to do here is to come into the wind..But go to the speaker.. Now your already in shotgun or rifle range.. The fox or coyote will not smell you...Kind of set up cross wind of the main sound beam of the speaker. the fox or coyote will enter the small area and head for the speaker. Sometimes good things do come in small packages...