The radiation pattern of an antenna in spherical co - ordinates is given by F ($\theta$) = cos4$\theta$; 0$\le$$\theta$$\le$$\pi$/2 The directivity of the antenna is
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The radiation pattern of an antenna in spherical co - ordinates is given by F ($\theta$) = cos4$\theta$; 0$\le$$\theta$$\le$$\pi$/2 The directivity of the antenna is