Roy Lewallen wrote:
In the process of confirming the 0.5 volt value, I found an error in a
popular text, Balanis, _Antenna Theory, Analysis and Design_. On p. 61,
he incorrectly states that the current along a short dipole "can be
assumed to be constant", which isn't true, ...

You must have the 1st edition. In the second edition Balanis says on page
133 that the current on an infinitesimal dipole can be considered to be
constant. On page 143 he says the current along a small dipole is
triangular shaped.
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73, Cecil http://www.qsl.net/w5dxp