What is the front-to-side ratio of the antenna radiation pattern shown in Figure E9-1?

Explication

Front-to-side ratio is read 90 degrees away from the main lobe, and there the plotted curve sits between the −12 dB and −24 dB rings, tracing to about 14.8 dB below the peak. Of the values offered, 14 dB is the nearest to that reading; the side response is stronger than the rear response here, so this ratio is smaller than the front-to-back figure.