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By considering the shadow region of diffracted rays and direct-feed radiation, the calculation of the power coupling between skew paraboloid antennas is modified. The skew configuration means there is an angle between the axes of two antennas, and the two antennas are placed in the back of half-space of each other. It is illustrated by considering the coupling between two identical front-fed symmetric paraboloid antennas, each of which is fed by a TE11 mode circular waveguide. The result can be used as guidance for the installation disposition of multiple antennas.