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We report experimental radiation pattern measurements of a transverse electromagnetic horn antenna at the millimetric/sub-millimetric frontier (280-350 GHz). The antenna is fed by a monolithically integrated uni-travelling-carrier photodiode illuminated by an optical beatnote (photomixing) at 1.55 μm. The detection is performed using an electronic sub-harmonic mixer and the whole characterization system is working at room temperature. Radiation patterns are measured in the E-plane and compared with electromagnetic simulations with a good agreement.