You'll find out that the sounds doesn't carry as far as you think it does. When calling in hilly country I set up a lot of times and call every holler or at least every other one. Especially if the wind is blowing or the leaves haven't fallen yet. Or if it is a really deep one and your calling deeper down in it.
I am new at the coyote hunting, and you fellows have touched on some issues I have some questions on. I have access to a couple of farms ranging from 200 to 350 acres. From what I have read, several other hunters have access to much larger farms. It is possible to call multiple times in the farms I hunt with some percentage of success.
The ticket is to always keep trying to get more calling ground. So you don't have to call any farm more than a couple of times a year. Notice I said, "That is the Goal". But most of us aren't that lucky, so we have to do what we can with what we have.
I don't have any problems calling a farm several times a year. Though I do make sure I don't use the same set up and sound every time. Never let them get into a routine of knowing a prey sound coming from that vicintity is danger. Just mix it up and try and trick their senses. Keep them guessing.
Usually I will give the farm at least a couple of weeks rest in between calling sessions. Others may do it differently but this is what works for me.