To measure the ground conductivity and relative permittivity with high frequency using an open wire line (OWL) you need to know about the behaviour of the end of the two-wire line:
The form of the end of the two wire line are two cylinder cones by sharpening. This form is approximated here by two hemispheres.
Picture: End of open two-wire line.
If you remove one half of the hemisphere at the equation "capacitance of two spheres, equal radius"  you get the capacity of the end of the open line:
By an substitution of the geometry in both general basic equations (capacity and resistance) you get the conductance of the end of the two-wire line:
Conductance and capacity are parallel.
 Wikipedia: "Capacitance"
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