Pre-tuned ; No tuning needed; 3.5dBd actual gain 1/2 wave plus C-load VHF; 6dBd actual gain 5/8 over 5/8 wave plus C-load UHF; 40-1/2" tall; Gold-plated brass plunger-type contact pin; Chrome-plated solid brass NMO base; Stainless steel whip; 150W power rating; NMO mounting; Mount sold separately;