Look for the fox to be in the thicker cover closer to human habitation now a days. Most are living on the edges and fringes of coyote group territories. I have several that travel here on my place. The female actually raises her litters here. I live in the edge of a small town with a few acres of my own.
Basically just downsize the tactics we use for coyote's. Think in terms of travel lanes and cover over just a few hundred acres.AND definately use softer high pitched sounds. Lip squeeks and hand squeeks are the best to start then use something like the close range calls discussed in the sounds and tactics thread. Anything other than low volume sounds will send them into the next county or at least the next farm for a while.I've actually called more fox with hand squeeks than I ever did with a mouth blown call. Jimmie