An adaptable homotropic antenna system for use with a portable communication transceiver is described. The antenna system can be used for reception or transmission and can be completely enclosed within the portable transceiver housing. The homotropic antenna system evaluates the quality of a received...http://www.google.com.hk/patents/US4584709?utm_source=gb-gplus-share專利 US4584709 - Homotropic antenna system for portable radio
