Construction of a 5/8-Wavelength Vertical Antenna for 2 Meters

This resource details the construction of a 5/8-wavelength vertical antenna specifically for 2-meter FM operation. The design focuses on eliminating loading coils and utilizes a series inductor to cancel capacitive reactance at the feed point, presenting a 50-ohm impedance match. The document illustrates three basic configurations, including a method employing a short-circuited coaxial stub for inductance, as implemented by K4LPQ. An alternative design is presented where the center conductor of the stub is extended one-quarter wavelength, creating a signal-frequency short and allowing for an insulated wire stub to develop the required series inductance. The article provides electrical theory and mechanical considerations for building the antenna, emphasizing the adjustment of stub length for proper impedance matching. This technical documentation is intended for amateur radio operators interested in homebrewing VHF antennas.