A system for measuring electric field strength of radio waves transmitted from cell station and arriving at an arbitrary measuring location is provided that includes a tuner unit, cell station ID (CS-ID) demodulator unit, signal level (or electric field strength) detector (RSSI detector), memory unit,...http://www.google.de/patents/US6006089?utm_source=gb-gplus-sharePatent US6006089 - System and method of measuring electric field strength
