A method of damping a conductor tube in a guide tube therefor comprises the steps of inserting a bag between the conductor and the jacket and filling the bag with a settable material to provide a resilient layer between the conductor and the guide tube. A radar pulse is transmitted with the antenna arrangement fully matched to achieve a lowest possible power loss of the pulse. The SCR catalyst has ammonia storage properties. A rectifier is coupled between the two pieces of metal, where the pieces of metal are strips, rings, patches, or other geometric combinations.