Over 40 years of experience in building 2-way radio antennas has taught the Childs Antenna Company to do the job right. Experience, Craftsmanship, RF research and design enable the Childs Antenna Company to control product quality. 100% factory testing insures quality performance. All antennas have VSWR of 1.5:1 or better and 50 ohm nominal impedance. All internal coil connections are soldered and not a spring loaded contact.