That is some great advice from AWS!
Make sure you have a shotgun when you are calling coyotes where there are lots of sage brush or junipers on flat land. With a shotgun you can find a decent calling spot quickly and easily. There are many great places to call coyotes with a shotgun that are terrible rifle calling locations.
I want to be able to see 30 to 40 yards to make shotgun calling stands. I really like the feeling of knowing if I see a coyote, it is in range and I can shoot it with my shotgun.
When you park your vehicle on flat land, check the wind direction before you walk away from your vehicle. Many years ago I figured out if I walk straight against the wind and set my e-caller about 10 to 15 yards straight against the wind from where I am going to lay down or sit down, I have more coyotes run right in on me in good shotgun range.
If you stay in that straight against the wind mode your scent trail will be a very narrow one. If you have your vehicle, yourself and your e-caller in a straight line you have a much better chance of the coyotes not smelling you, your vehicle or your e-caller.
If the sage brush is 2-1/2 to 3 feet tall and on flat ground you don't have to walk all that far away from your vehicle or have a great hiding spot for your vehicle. When I walk away from my vehicle 200 yard to 300 yards, I turn around and look at my vehicle and then crouch down to get my eyes down at about the height of coyotes eyes. If I can no longer see my vehicle because of the sage brush being in the way, I know I have walked far enough away from my vehicle to start calling.
If the brush is not high enough to hide me when I sit down I like using a firm home made packing camo pillow to prop my head up or lean it up against a bush so I can recline back against the pillow so my head is not sticking up higher than the bush I am sitting in front of.
PICT0011 by [/url], on Flickr
In the above picture my son is laying down with the camo packing pillow holding his head up.
[url=https://www.flickr.com/gp/156463377@N08/x82w56 t=_blank]IMG_2400 - Copy (2) by https://www.flickr.com/photos/156463377@N08/, on Flickr
In this above picture my son is raising up from the pillow, getting ready to shoot the coyote that didn't know he was there.