The pilot departed with charts which did not depict accurately the area the airplane overflew. He continued VFR flight into IMC conditions. The airplane was not equipped nor certificated for flight in instrument conditions. While in cruise flight, the airplane impacted a 971' tower 30' below the top. A witness at the accident site indicated that visibility was restricted to 100 yards in fog. Toxicological analysis of blood from the pilot revealed high levels of fluoxetine (Prozac) and norfluoxetine (metabolite of fluoxetine).