These half wavelength resonant dipole antennas are the foundation of every compliance testing lab. Initial designed by Willmar K. Roberts, these precision made half wavelength dipole antennas are the ideal solution for site attenuation measurements. Each antenna is manufactured with a balun loss of less than 0.5 dB and a VSWR of less than 1.5:1 The half wavelength resonant dipole antenna is the simplest antenna from a theoretical point of view, and are commonly used as a gain reference.