Copyright 2011 by John Wiley & Sons, Inc. All rights reserved The original intent was to update Electrically Small, Superdirective, and Superconducting Antennas with a second edition. Sufficient material became available to broaden the scope of that book; the result is this book with a new title. This book provides mathematical foundations for important topics including ENG shells, ESA with m or « cores, including lossy cores, and focused/subwavelength imaging.