foxhunter,
I have the yellowhammer woodpecker tape which I have used for coyotes. I don't think I have tried it on foxes yet, but it works on coyotes. You are probably hunting/calling reds where you live, but here in Nevada, we have grays and kits. I know the kits are pretty much nocturnal, and I would say the same for the grays since I have yet to call one in during daylight hours. But I guess foxes are foxes regardless of where we live. The woodpecker tape woould probably work, but maybe early morning and after dark. Can you hunt at night with a light where you live? If you can, give it a whirl.
I have had very good luck using the rabbit distress tape after dark for the foxes.