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The gain-phase distributions of an electromagnetic field and horn antenna radiation patterns for planar tasks, with the horn antenna in a combination with various close located objects, are submitted. The problem was solved in the time domain, then by means of Fourier transformation was translated into the frequency domain. The problem solution in time domain allows one to analyze objects with sizes of 500/spl times/500 wavelength with a digitization step of 1/20 wavelength (100 million units of a grid) on a personal computer with a 2 Gb operative memory. An example of the analysis of distortions of the radiation patterns by phased array obstacles and objects is given.