I've held off answering this question as it is extremely variable. Most of you will probably agree that when you call, your stands may only be .5 to 2 miles apart. If a coyotes home range is 7-8 miles, does this mean only one pair of coyotes live in an oval 7-8 miles square? I think not. A coyote may range 7-8 miles, so some would call this their home range. In reality, several coyotes occupy this same 7-8 miles with many home ranges overlapping. The 40 miles mentioned is not home range. These are called sorte's or forays. That's like saying your once a month trip to the big city is your home range. You may go there, but it is not your home range. The key to all of this home range stuff is learning what the "core" home range is. This is where coyotes spend most of their time and will defend from other coyotes. That's why when you are calling and the coyotes will howl at you but won't come. You may not be in their core area. Sometimes if you move closer to them and howl, they'll almost run right over you. You've intruded into their core area.
When I'm calling, I don't worry about home ranges. All I want to do is move closer to or get in the middle of a core area. Sometimes these core areas may be no bigger than a creek bottom .5 to 1 mile long.
Hope this helps.
Tactical 20. You must have an exceptional gift to be able to tell the difference between coyotes 7 miles apart. Unless of course it had no tail or 3 legged etc.