An antenna element including a loading coil is telescopically extendable and retractable from within a housing tube. A characteristic impedance of a transmission line from a lower end part of the antenna element to a cable is equal to one of a cable. A part of the loading coil is reinforced. A branching...http://www.google.fr/patents/US5072230?utm_source=gb-gplus-shareBrevet US5072230 - Mobile telescoping whip antenna with impedance matched feed sections
Mobile telescoping whip antenna with impedance matched feed sections
