On Fri, 10 Apr 2009 07:54:41 +0100, Brian Howie
wrote:

Diffraction off the edge of the reflector. It causes backlobes. It's
not a fault.

Hi Brian,

You have hit the nail on the head. More, you have pushed in the tack
with a 10# sledge. This design we are talking about suffers immensely
from the violation of observing what you comment upon.

It is very much a fault.

73's
Richard Clark, KB7QHC