Abstract
An electrically short dipole antenna radiating high‐frequency waves is instrumented insuch a way as to directly measure its radiation impedance when immersed in a laboratoryplasma. By measuring both current and voltage at the radiating end, transmission lineeffects are largely eliminated, and extremely accurate results can be obtained. Initial resultsare presented for wave frequencies ranging from lower‐hybrid to whistler, for densityvarying from 2 × 10
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