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.
1 .875-mile paved oval with the turns banked 12-14 degrees, four degrees of baking in the backstretch and 10 degrees in the frontstretch.  The track opened in 2006 and the first NASCAR sanctioned race was a K&N Pro Series combination event on May 20, 2007 won by Joey Logano.