Explore planar antenna design in this comprehensive class covering slots, patches, and vivaldis. Delve into the intricacies of antenna basics, starting with an introduction to slots and progressing to patch antennas. Learn about circularly polarized patches and their applications, followed by an examination of microstrip lines. Discover the unique characteristics of Vivaldi antennas and their uses in various fields. Conclude with valuable tips and tricks for practical antenna design and implementation. Gain essential knowledge for hobbyists, engineers, and anyone interested in wireless communication technology through this 51-minute lecture, part of the HackadayU Introduction to Antenna Basics series.