In a recent NAAA newsletter, a notice of an ag pilot death in Oklahoma details that the pilot hit wires after finishing a field a heading for the next.  He hit the 410 foot tower about 20-25 feet from the top. The newsletter states: "This accident reminds pilots to remaining vigilant outside the aircraft at all times.  Although the exact reason for hitting the tower may never be known, we remind pilots that even when the field is finished, not to concentrate on planning and setting up for the next job at the expense of safely flying the aircraft."  RIP Rodney Sherry.