log periodic antenna radiation pattern
This pattern is uni-directional while it can be made bi-directional. The radiation pattern of the rhombic antenna is shown in the following figure.
The log periodic high gain antenna gave the following results.

. Proceedings of the International Conference on Non-Ionizing Radiation at UNITEN ICNIR 2003 Electromagnetic Fields and Our Health 20th n 22 d October 2003 5 R W muWCm2 10 26390 75 4685 100 2639 These values for the high gain antenna refer to the intended direction of maximum radiation and decay. The resultant pattern is the cumulative effect of the radiation at all four legs of the antenna.
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