the present invention relates to a series fed collinear antenna which includes cone - shaped radiating elements energized via a series fed common transmission line . phasing stubs are provided between selected radiating elements and are oriented such that the phasing stub improves gain and reliability by affecting the signal to produce a beneficial elevational coordinate signal pattern . the radiating elements may be cones . each cone has an associated base diameter . the base diameter may be uniform , resulting in similarly sized cones , or a cone may have a distinct base diameter resulting in differently sized cone elements .