The present invention relates to a multi-stream communication system comprising a transmitting node provided with a polyphase antenna and a receiving node provided with an antenna arrangement configured to receive multiple data streams. An interior illuminator has: cold cathode tubes 5, 6; a cold cathode tube driving circuit for driving the cold cathode tubes 5, 6; manipulation switches 12, 13, 14 and 15 for turning on and off the cold cathode tubes; and a housing 2 that houses the cold cathode tube driving circuit and holds the cold cathode tubes and the manipulation switches. The treatment portion includes a replaceable treatment media and is configured to receive the groundwater from the inlet portion and expose the groundwater to the treatment media. A contact electrode on the beam member faces the gap. An additional transistor is digitally controlled to drive up operating voltage and current upon issuance of an active command representing read, write, andor refresh of memory. A web browser-based graphical display is generated that identifies the current location, usage status and department assignment of each trailer.