In 1990, Maloney et al. [165] presented accurate results for the radiation from rotationally symmetric simple antennas, such as cylindrical and conical monopoles. Boonzaaier and Pistorius [166,167] presented results for the radiation from thin wire dipoles and thin wire Yagi antennas. More recently, Yagi antennas were also studied by Kashiwa et al. [168]. In 1992, Tirkas and Balanis [169] presented results for a monopole on a ground plane, while Luebbers and co-workers [170,171] presented mutual coupling and gain computations for a pair of wire dipoles. Subsequently, Maloney et al. [172] presented a simple 1-D approximate TEM feed model for the FDTD method and used it to analyze a monopole backed by a plane reflector.