A chart from his complete tests is shown below.
Copper is one of the best RF conductors available - silver is even better.
The special design of the Trucker 5000 floating coil will not ice up and stop working or break, even in severe winter conditions. This means that using Wilson s design techniques, the 5000 Trucker will not ice up and short out the windings as is possible with the open coil designed antennas. The highly engineered thermoplastic cover protects the coil from the harsh environmental conditions encountered on the open road. Due to the increased torque applied to the mount with the Trucker 5000, it is recommended that only a stainless steel stud mount be used with the Trucker 5000. The Trucker 5000 was designed specifically for users who want the best in a high performance antenna with the ability to withstand some serious power.