I just recently bought a CB antenna for my car and the SWR's are pretty high. I tried installing the antenna this afternoon and my SWR's are almost hitting three. Years ago I bought a Radio Shack SWR meter and I'm setting it with that. For some reason no matter how much I move the Whip up or down it's right around 3 ( almost in the Red ). This is a Based Loaded Coil Magnetic mount with a 10oz magnet and a 35" 17-7 Stainless Steel Whip. I have it mounted on my trunk. I do have a small VERY THIN cloth under the magnet, would that affect the SWR's? Also I needed to add about 2 feet of cable to the factory cable. Would these things affect it?