In my area, higher pitched calls like a bird distress call seem to work better than the lower coarser sounding calls.
I do agree that you need to set up where there are lots of brush piles or blow downs. Usually a riverbottom will yield a cat.
Another thing I will mention...it takes a long time for a cat to come to a call. If there is a chance for a bobcat in an area, I will usually not make coyote sounds, and I'll wait for 45 minutes or so.
I've heard that a bobcat won't come in if you're making coyote sounds, but I have called in a bobcat after howling and barking. So who knows.
Good luck and take pics if you get one.