Application: Antenna with the direction of radiation fixed in azimuth, vertically polarized, with horizontal polar diagram.
Derivative from this file.
(in English) (1993)  315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 32  DOI:  10.1109/IEEESTD.1993.93397. ISBN:  0738109479.
Michel Bakni