The same as classical dipole except that the length is less than one tenth of the wavelength.
Only the frequency, element diameter and length are required.
As usual all results: AS IS, no responsibility assumed.
A Yagi Diagram
Note:
As the width decreases we approach that of an isotropic antenna. However if the width is 0, how can the element be excited?
There is a gradual transition between the isotropic sphere and the half wave dipole donut.(Dunkin?)