Substantially-linear dipole antenna for safety helmets, of the type comprising two conductive branches arranged to be electrically connected, at one of their ends, to respective radio equipment, the two conductive branches being disposed substantially aligned. Broken excrement may be certainly drained. The system comprises a navigation bit synchronization engine operable to detect one or more indicators in one or more data samples received from a GNSS satellite. A response to the client device is generated, and the response is a response to the enrollment request that includes the device identification. When given temperature stresses have been applied to the wafer, the wafer is conveyed to an evaluation unit.