Wires are very hard to see no matter how careful you are.
While Cherry Drying in Washington State....I would always do a Recon (Recce) of the field before I flew in it blowing the water off the Cherry Trees.
Despite that....one afternoon with the Sun in the wrong direction....I came scary close to cutting down a set of wires going to a water pump house.
A few days later....two other aircraft hit wires....one being a Fatality.
If you have done utility or ag work with a Helicopter for any length of time.....you probably have had a close call or two with wires.