Describe the term 'radiation pattern' of an antenna.

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The term 'radiation pattern' of an antenna refers to a graphical representation of the distribution of radiated energy as a function of direction. It illustrates how the energy emitted by the antenna varies with different angles, showing peaks where most energy is transmitted and nulls where little to no energy is radiated. This pattern is essential for understanding the coverage area of the antenna and its effectiveness in different directions, which is crucial for applications such as communication systems and broadcasting.

The other options focus on aspects that do not precisely define the radiation pattern. For instance, a representation of the antenna's physical appearance does not convey information about the energy distribution. A measurement of signal strength describes the power level rather than the directional characteristics of radiation. Similarly, a depiction of frequency response relates to how an antenna performs at different frequencies rather than the directional distribution of its radiated energy.