On 6/25/2010 12:06 PM, Szczepan Bialek wrote:

They must: " In electronic circuit theory, a "ground" is usually idealized
as an
infinite source or sink for charge, which can absorb an unlimited amount of
current without changing its potential."

Your mistake here is to assume that because they can sink current that
the are sinking DC current. The "ground", as you like to think about it
may carry current during the RF cycle, but there is nothing that would
cause an unbalanced charge buildup since it IS symmetrical.

tom
K0TAR