A model in NEC or EZNEC would easily show the effects of such a termination on the pattern because these programs take account of the radiation from the wires. In theory neglecting that radiation the terminated rhombic has no standing waves while the unterminated rhombic has standing waves an so currents in both direction. But if the rhombic is long there isn't much current to be reflected at the unterminated end. Where a rhombic as only a wave or two per side, the uniform current theory works adequately. Where its ten wavelengths on a side its convenient but questionable for predicting performance.
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