Radiation from a slot antenna surrounded by a plasma sheath moving parallel to an external magnetostatic field is considered. It is shown that the radiation pattern is inclined in the direction of the sheath motion as the velocity is increased except for the case where the condition of upper hybrid resonance is satisfied in the rest frame of the plasma. When such a relativistic upper hybrid resonance caused by the sheath motion arises for certain values of normalized plasma and cyclotron frequencies and the velocity parameter, a deep null and a rapid oscillation appear in the radiation pattern, and as a result the shape of the pattern is extremely deformed.
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