In article . com,
"RHF" wrote:

Telamon,

Being Well Grounded is the Best Foundation for Every Radio Shack
http://groups.yahoo.com/group/Shortw...a/message/9152

The Third Wire in the AC Power Cord is by-design an "AC Power Return
Path" -not- and RF Signal Ground Path.

Snip

I know that but it still operates as an RF return. The impedance is
higher than what you would want for it to be a good ground and worse it
usually has plenty of noise on it so it should be your last choice.

If the mutual inductive coupling to the hot and return wires was not bad
enough the ground wire often carries noise currents capacitively coupled
from the insides of devices.

--
Telamon
Ventura, California