we get foxes alllllllll the time
best method (already mentioned) is to put human hair (just get your sweepings next time you go for a trim) into the end of a pair of tights and place these around the area at knee height
works for us, the foxes kept eating our cats
urine does work too, but not very pleasant and useless in the rain
game turd from tigers etc doesnt really work either, if the fox is uber territorial it will simply roll in it.....and then walk up your car
dont shoot it, thats illegal