Shadow loss
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In telecommunication, the term shadow loss has the following meanings:
- The attenuation caused to a radio signal by obstructions in the propagation path.
- In a reflector antenna, the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
Source: from Federal Standard 1037C and from MIL-STD-188