Radial Wire

"The vertical is a popular antenna among hams who lack the space for a beam or long wire antennas. In an electrical sense, a vertical is a dipole with half of its length buried in the ground or “mirrored” in its counterpoise system. Verticals are commonly installed at ground level, although you can also place a vertical on the roof of a building ( Used with permission from the ARRL, http://www.arrl.org/verticals")