http://radiobuilder.blogspot.com/2010/05/tactical-antennas.html

Excerpt from Website:

LESSON DESCRIPTION:

In this lesson, you will learn about the types of tactical antennas and their radiation patterns. In addition, you will learn about fabricating field expedient antennas using various repair techniques.

TERMINAL LEARNING OBJECTIVE

ACTION: Explain basic antenna theory.

CONDITION: Given this lesson.

REFERENCES: The material in this lesson was derived from FM 11-32, FM 11-64, FM 24-18, FM 24-19, and TC 24-24.

INTRODUCTION

Tactical antennas are designed for efficiency and ease-of-use, and are ruggedized to take the abuse they receive in the field. Some antennas are easy to use, such as a whip antenna that is used in high mobility operations. Others, like directional antennas, require a working knowledge of antenna engineering. All antennas either release or capture electromagnetic radiation.”