Helena, Badgers are territorial, but not in the sense that you could keep them out by using a fake badger to warn them off. The territory of a particular badger family is really just its regular hunting ground, a kilometre or more across, but these territories all overlap. Even though badgers definitely treat the ground very close to their setts as "theirs" they don't seem proprietorial about the further country they range over. Also, it seems to us that badgers from different setts, even quite far apart, do visit their neighbours occasionally, as there are well worn runs, often very old, that seem to link the setts. Our own main sett, which is pretty extensive, had already been there "for ever" in the late 19th century.