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In this paper, we propose a novel calibration method that uses only the short-open-load (SOL) standards and requires no through connection. The uncertainty of the measurements is the same as that of the unknown thru method and almost the same as that of the SOLT calibration. That is, using the proposed method, we can measure antenna characteristics as accurately as using the SOLT calibration, without any through calibration procedure. To show the validity and usefulness of the proposed method, we measured the S-parameters between two log-periodic antennas. Comparing the results with those obtained by the unknown thru method and the SOLT calibration method, S11 and S21 agreed with each other within 0.001 and 0.03 dB in the operating band, respectively.