In a radio communication system, a number of downlink component carriers can be aggregated for communication between a network node and a User Equipment. According to the invention, this object is achieved in that a cylinder is disposed at the base coaxially to the casing. Thus, even when a slight short-circuit that does not lead to a current defect occurs, the short circuit can be detected. The Defogger can be utilized in hotels, motels, homes, or any where steamvapor travel can accumulate onto glass or mirror surfaces.