IMO...location and call volume are the 2 most critical variables that will help score more bobcats.
In my experience, bobcats tend to hang out in thick brush. They seem to want to stalk in the brush to get close before they launch their attack. The can burst in blinding speed but only for a short distance when compared to coyotes. So when I am targeting bobcats I close the distance to thick brushy and rocky areas. I have had the most success inside of 300 yards to cover. You still might get foxes and coyotes that show up as a bonus. I set up where I can watch along the brushlines. Many times the bobcats come to the edge and seem to assess the situation.
I have also had more luck using lower volumes on bobcats. Bobcats seem to be more sensitive to call quality and volumes, whereas coyotes seem to come in more frequently when I crank the volume.
Bobcat hunting can be a pretty low percentage success rate mainly due to their lower populations when compared to coyotes so be ready for blank stands if you are specifically targeting bobcats. But it is a great feeling when you do connect.
Good luck and good hunting.