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Characteristics of flat symmetric antenna of axial radiation 150 mm long with linearly extending aperture for angels of the aperture 30˚, 60˚ and 90˚ were studied. Thus directional diagram of antennas have been theoretically calculated, experimentally measured and analyzed, is revealed that characteristics of experimentally measured directional diagram well will be agreed with the developed mathematical models in the range of the frequencies of 5,9-12,5 GHz. On the obtained experimental data dependence of coefficient of the directed operation of the studied antennas on an angel of a aperture is revealed.