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The illustration in the vertical axis represents zenith angle theta in degrees from 130 to 30 in a decrement of 10 from the bottom to the top. The antenna is fairly directive. The energy is radiated, through the main lobe. The pattern exhibits several side lobes and back lobes. The normalized radiation intensity in d B for the main lobe is 0 d B. The normalized radiation intensity in d B for the first side lobe is negative 20 d B. The normalized radiation intensity in d B for the minor side lobe lies between negative 30 d B and negative 40 d B.