A standard ground system widely used for mast radiator broadcasting antennas operating in the MF and LF bands consists of 120 equally-spaced buried radial ground wires extending out one quarter of a wavelength (.25formula_1, 90 electrical degrees) from the antenna. No. 8 to 10 gauge soft-drawn copper wire is typically used, buried 4 to 10 inches deep. For AM broadcast band antennas this requires a circular land area extending from the mast . This is usually planted with grass, which is kept mowed short as tall grass can increase power loss in certain circumstances. If the land area available is too limited for such long radials, they can in many cases be replaced by a greater number of shorter radials, or a smaller number of longer radials.