Gene Fuller wrote:
Cecil is so good at quoting that he should have no problem with
providing the exact unedited words from Kraus that support the
arc-cosine analysis.

"It is generally assumed that the current distribution of an
infinitesimally thin antenna is sinusoidal, ..."

Simply look at Kraus' graph in Figure 14-2. A sinusoid with
current amplitude equal to 1.0 at the center and current
amplitude equal to zero at the end is obviously a cosine
wave. Since the magnitude varies from 1.0 at the center to
zero at the end, taking the arc-cosine of the magnitude
yields the distance from the center in degrees.
--
73, Cecil http://www.qsl.net/w5dxp