Ok heres for another update:

The vertical bars are, I guess, tubes made of stainless. They are
enclosed at the bottom in a rectangular section and the top disappears
into the horizontal bar. Therefore the ends are not open, either to
cause 'organ pipe' resonance, or to put sand in (which is an idea I
liked).

Maybe I can drill holes at various spacings down the tubes and cause
them to play a nice melody with the wind!!

The idea about wrapping a wire or tube around in a spiral sounds good,
this is also used on electric transmission lines -
http://tinyurl.com/anqaq

Once again, thanks for all the answers! Now for an interesting weekends
work

PS: after asking this question, arriving home in the evening to find no
wind and complete silence amazed me. First time the wind ceased in 2
months!! This group is REALLY effective!! lol