A coupled multi-segment helical antenna is provided having a length that is shorter than otherwise obtainable for a conventional half-wavelength antenna. The coupled multi-segment helical antenna includes radiator portion having a plurality of helically wound radiators extending from one end of the radiator...http://www.google.es/patents/US5990847?utm_source=gb-gplus-sharePatente US5990847 - Coupled multi-segment helical antenna
