The 3" Francis CB22 CB Antenna is pre-tuned from the Francis Antenna factory so tuning it to the vehicle is usually not necessary making it the antenna of choice for anyone needing to easily and quickly mount an antenna without the hassle of tuning. 36" in Overall Length 3/8" - 24 Threaded Base to Accept All Standard Antenna Mounts Double Quarter Wave Fiberglass CB Antenna Whip Chromed Brass Ferrule Traditional Sleek Style That Reduces Wind Drag Load Each Antenna Is Individually Tuned For Maximum Performance Exclusive Double Helical Winding Winding Sealed Inside Fiberglass For Long Life And Durability Custom Fiberglass Formula For A Flexible, Long Lasting Antenna