"Monopole Antennas" provides an industry standard for the modeling, testing, and application of airborne and ground-based monopole antennas. This book, with more than double the content of the author's previous, sold-out book, "Monopole Elements on Circular Ground Planes", includes structures in proximity to flat Earth in addition to those in free space of the earlier book. It also features state-of-the-art numerical methods, including Richmond's method of moments for disk ground planes and the Lawrence Livermore Laboratory's Numerical Electomagnetic Code for radial-wire ground planes.