Why just here? Why just this section of power line?

Yes, I know. It's an old, well-told story: why birds sit on power lines. I've been told the lines are slightly warmer than other surfaces in the winter. This warmth, from the passing electricity, makes the lines a favourite perch. 

But I have another question: why did the birds pick these three power lines. No bird perched on the wires to the other side of the wooden poles. Not a one.

 And if one looks about, one immediately notices that there are no birds, not a one, perched on any of surrounding lines -- and there are a lot!