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Dipole segmentation is used to estimate the radiation resistance of thin antennas of arbitrary elevation and configuration over a perfectly conducting ground plane. Utility of the method for estimating the radiation resistance of VLF/LF trailing wire antennas from aircraft depends upon the extent to which the current distribution deviates from a sinusoid. That deviation is due in part to finite wire thickness as well as the finite conductivity of both wire and ground. The influence of those effects requires further study.