This invention addresses a method of scanning and self organization that is programmed into the base station which then will automatically avoid mutual interference and move the use of radio channels from one base station to another to move network capacity to where it is needed through a process called \u201cabandonment. A plurality of echo soundings are collected, the soundings produced by an ultrasonic transmitter and detected by an ultrasonic receiver. At least a major part of the surface of the electrode rod that is in contact with the quartz glass material is provided with grooves having a substantially longitudinal direction.