From wiki:
Quote:
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The power consumed by radiation resistance is converted to radio waves, the desired function of the antenna, while the power consumed by loss resistance is converted to heat, representing a waste of transmitter power.[2] So for minimum power loss it is desirable that the radiation resistance be much greater than the loss resistance. The ratio of the radiation resistance to the total feedpoint resistance is equal to the efficiency of the antenna.
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It makes sense for a transmitter but for a receiving ferrite loop stick; the power for radiation resistance very small but is large compared with the incoming signal (-50 to -100 dBm?) from the free space.