... main material is Oxidation aluminum alloy , this material can more effective to prevent the antenna outdoor from acid rain, alkaline ... Gain:7dBi,9.5dB,11dB,12dB,13dB,16dB. (can select) Front to back ratio:≥12dBVSWR:≤1.5Input impedance:75ΩPolarization:V ... Company have a professional engineers team,can design the products as your specification. 4. Can get samples before production?Re:yes , Preproduction ...