A tip I was taught early on:-
It's a lot easier to see a line of posts or pylons than it is to see the wires between them.
The area of ground round each post or pylon tends to be different as well due to grazing/planting/harvesting restrictions which also helps visibility.
The regularity of the spacing is also helpful in highlighting them against the irregular background.
One other trap for the unwary. Due to the prevailing wind in the UK it is common to be landing in a westerly direction, which puts a low sun smack in your eyes at the end of the day.
However there is little to beat the still air and beatiful views of sunset.
Mike