Richard Harrison wrote:
Page 345 gives the surge impedance in ohms for a balanced antenna as:

Zo = 276 log 1/P

Bailey`s graph on page 345 gives dipole impedances from 70 ohms to 680
ohms for rod peripheries from 1 wavelength down to 0.00001 wavelength

Is the graph impedance looking into 1/2 of the dipole?
276 log 1/0.00001 = 1380 ohms, just about double the 680 ohm value.
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73, Cecil, http://www.qsl.net/w5dxp