Baited electric fences have been an option for deterring deer for many years, but the simplest type - the peanut butter fence - actually dates back to the late 1970s. Basically, a peanut butter electric fence consists of a metal wire suspended from fiberglass stakes, surrounding up to 3 to 4 acres, and electrified with a grounded commercial fence charger. At approximately every three feet along the wire, a foil strip laced with peanut butter provides bait to attract deer. Vegetation should be cleared within 10 feet beyond the outside of the fence in order that the deer will be able to see the wire and flags. When the deer touch the wire(s), they receive an electric shock and learn to stay away from the area.