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.
... are 928 housing units at an average density of 173.1/km² (447.3/mi²). The racial makeup of the town is 89.99% White, 4.23% African American, 0.97% Nativ ...