"Earth ground affects transmitted RF because the radiated RF impinges on
the earth and is absorbed and reflected, the ratio between the two being
affected by the parameters of the earth (conductivity and permittivity).
There is no such E-field between the coax and the earth due to the
common mode current on the coax shield."
Dave, common-mode current in coax shield is no different than current in
a dipole, say one low to the ground. If you connect a wire from any
point on the dipole to ground, current will low. At least NEC thinks so!
Brian
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