Childs Antennas Company has been doing business since 1977 with 2-way radio antennas and has given the the experience to do it just 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.