[Elecraft] RE:RF Ground

[Stuart Rohre]

If the center conductor and shield are shorted at the rig, ONLY the shield 
has any effect, and velocity factor does not enter into the action of this 
type of counterpoise.

There is another type using coax, where a capacitor shorts the shield and 
braid for RF purposes, (0.001 mf ceramic disc cap) at the far quarter wave 
away end.  However with that implementation, I would predict not velocity 
factor, but the effect of shield to center capacitance or the bigger 
diameter of the shield to affect the length needed for quarter wave 
equivalent.

Stuart
K5KVH