As the name suggests, the dipole antenna consists of two terminals or "poles" into which the radio frequency current flows. This current and the associated voltage cause an electromagnetic or radio signal to be radiated. A dipole antenna generally refers to an antenna that consists of a conductor of resonant length to enable it to be connected to the feeder, as shown in Figure 1. The dipole antenna is symmetric when viewed azimuthally; as a result, the radiation pattern is not a function of the azimuthal angle. Hence, the dipole antenna is an example of an omnidirectional antenna (Antenna Theory.com, 2011). Also, the E-field only has one vector component, which means the fields are linearly polarized. When viewed in the x-y plane (for a dipole oriented along the z-axis), the E-field is in the negative y direction. As such, the dipole antenna is vertically polarized. Another antenna design, the monopole antenna, as shown in Figure 2, is closely related to the dipole antenna.