The Antenna Experimenter's Guide
-- by Peter Dodd, G3LDO.
This book encourages experimenting by taking out the guesswork. It describes how to build and use simple RF equipment to measure antenna parameters such as impedance, resonance and performance of both homemade and commercial antennas. There's much for the keen designer, including general antenna and mast construction methods, how to test your theories, and how to use a computer to analyze experimental data and model antennas.
The Antenna Experimenter's Guide