If you have trouble viewing this video, please enter this URL into your browser search box: https://youtu.be/tZyPcM2Nm38. This is part 4 of the microwave antenna demonstration from The Society of Amateur Radio Astronomers. In this segment, we learn about Diffraction, 2-slit, Knife Edge Frensel Lens Antennas, and other related subjects. Well produced and easily understood tutorial. This would make an excellent presentation to an Amateur Radio License Class or for a club presentation on microwave antennas. 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).