This kit is designed for roof mounting in RV's or any vehicle with a ground plane deficiency.
The Firestik series of no-ground plane (aka NGP) antennas are designed specifically for vehicles lacking a counterpoise, or ground plane. Commonly this type of antenna is used on RV Campers, Semi's, and Motorcylces, although not limited to these types of vehicles, no-ground antenna systems are designed to work anywhere on anything. So long as you can find a way to secure the antenna, it will work.
This is a complete antenna system including the antenna, mount, and coax cable. No additional parts are needed.
Please note: NGP antennas can only be used with the included parts, you cannot cut the coax cable nor add any to make it longer. The coax cable included with this kit cannot be altered, changing the length will cause the antenna system to potentially damage your CB. It is highly recommended you do not change either the antenna or coax with this system. You may however use a different mounting bracket and stud.