Specifically Designed for the Wilson 2000 and 5000 Trucker,Firestik And Wilson Fiberglass Antennas .WORKS ON ALL ANTENNAS THAT HAVE THE STANDARD 3/8 X 24 THREAD This Radial Kit Consists of 6 Heavy Duty Steel Radials that are 4" long that securely screw onto the Wilson 2000/5000 Trunker Antenna Coil Improves Antenna Performance with better Ground Radiation. Also Improves Receive, allowing Better Copy of those Marginal Stations. Do these actually work? Do they go on the bottom of the coil or at the bottom of the antenna itself? I'm gonna put me a set of Wilson 5000 Truckers on a 2000 model Peterbilt and I'd like to know if these will help me, hurt me, or just make people ask weird questions about them....LOL!