The above description is the basic idea of what is going on with the Yagi-Uda antenna. Yagi antenna design is done most often via measurements, and sometimes computer simulations. For instance, let's look at a two-element Yagi antenna (1 reflector, 1 feed element, 0 directors).
Though there are no detailed records of when the sport of track and field began, experts say that track and field history can be traced back to 776 B.C. Track and Field History Experts say that track and field history can be traced back to 776 B.C when a cook named Koroibos, from Elis, won a race that was run over 600 feet distance. It is believed that this was the only athletic event for the initial 13 Olympic Games.
NASCAR was formed on February 21, 1948. On December 14, 1947 talks began at the Ebony Bar at the Streamline Hotel at Daytona Beach between Bill France and other racers. June 19, 1949 Charlotte Speedway marked the first race, a 150 mile event.