This book presents means and technologies to reduce interference that affect the reception of radio, television and radar signals. Various alternatives to mitigate interference, created intentionally or inadvertently, and their underlying theories are discussed. Key topics include adaptive interference cancellation, interference rejection by a fixed or adaptive array, adap This book presents means and technologies to reduce interference that affect the reception of radio, television and radar signals. Various alternatives to mitigate interference, created intentionally or inadvertently, and their underlying theories are discussed. Key topics include adaptive interference cancellation, interference rejection by a fixed or adaptive array, adaptive separation of signals, and innovative applications of closed loop cancellation technology in acoustics, direction finding and in instrumentation.