ORIGINAL: Shotgun Mike
If im shooting foxes from a vehicle with the lamp a piece of polystyrene scraped on glass may work or as coyote caller said calls produced with your mouth or hand. Some manufactured calls are the mutts nuts but others are rubbish and steer clear of them.
What state do you live in? Up in NY we are not allowed to shoot from a vehicle I believe. I'd be interested in the states logic behind allowing that.