1,Fully automatic fender mount 2,Center coil-loaded heavy duty spring 3,5 sections,replaceable mast 4,Large mounting head power car antenna HNT801X Fully automatic fender mountCenter coil-loaded heavy duty spring5 sections,replaceable mastLarge mounting headExtend to 39"Detachable cable82" If you are interested in this kind of car antenna ,please feel free to contact us