Discussion
What is the gain penalty of a log periodic array compared with a Yagi of similar size?
Answer: D
Since only a few elements radiate at any one frequency, the effective aperture is a fraction of the boom length and the gain is several decibels below a Yagi occupying the same space. That is the price of the bandwidth. Driving every element does not help because most carry little current. The trade between bandwidth and gain for a given size is one more instance of the general rule that nothing in antenna design comes free.
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