[TowerTalk] Feedline (choke) question

[Brian Beezley]

"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