An excellent tutorial on the simple physics of a Yagi Antenna from Electrical Engineer Diana Eng. Her use of a lightbulb to to show the effect of reflectors and directors on a dipole antenna is especially good. Although the video is a bit dated (03 February 2010), the basic information is still good. This video would make an excellent introduction to directional antennas for a Technician Class License workshop. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free e-mail subscription or by tapping into the blog RSS feed. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM.