A system is described for raising and lowering an antenna without using an electric motor or hand crank. A shaft is attached to an antenna mounted to the roof of a recreational vehicle. A first adapter engages the shaft. A second adapter couples with the first adapter. A portable self-powered activating...http://www.google.es/patents/US5446472?utm_source=gb-gplus-sharePatente US5446472 - System for raising and lowering an antenna
