I should have added: Although my wrought iron light fixtures are electrically
grounded, they are not at rf ground.

The ground wires roam a bit with the a.c. hot and return wires before it gets
to an earth ground. Thus rf energy captured by the power lines is coupled to
the ground wire.

Of course, I get, besides direct (computer system) and harmonic in-house noises
in the AM/FM(!)/SW bands, I get my neighbors', the power company's, and
others'. G

Bill, K5BY