Electric field?
In 2009 the started erecting these fancy new "Wintrack' pylons here in the Netherlands. They also quite futuristic and as a big benefit they reduce the electric field around the pylons significantly (the graphs in the link below illustrate this) as a result of their design, which was the main criterion. I was wondering if the design of the T-pylons also takes this into consideration?
http://www.inmr.com/dutch-grid-operator-extends-use-new-transmission-line-design/