The Radar Systems Engineering Series consists of seventeen lectures; each lecture is offered as an individual tutorial. The goal of this series is to provide an advanced introduction to radar systems subsystem issues for first year graduate students, advanced senior undergraduates or professionals new to the field. The material will be most accessible to university graduates with a Bachelor of Science degree in Electrical Engineering, Physics, Mathematics, Computer Science / Engineering, or Mechanical Engineering and who have a solid understanding of Electromagnetism and their fields, Probability, and Calculus through Differential Equations, Vector Calculus, and Linear Algebra. Each tutorial consists of a screen-captured PowerPoint lecture narrated by Dr. O'Donnell. In each tutorial Dr. O'Donnell has broken his lecture into one or more separate segments for ease of viewing. All of the material in these tutorials is subject to copyright laws. In the first segment of this lecture Dr. O'Donnell reviews the specific copyright information for these materials. Following this brief video, the first segment of this lecture will begin. You may also access copyright information by viewing the video listed below on this course page. In his first lecture on antennas (and eighth lecture in the series on radar systems engineering), Dr. O'Donnell outlines antenna basics including field regions, electromagnetic field equations, polarization antenna directivity and gain and antenna input impedance. He concludes with a discussion of mechanical scanning antennas. This lecture is divided into four parts.