A structural wideband aperture assembly and methods are presented. A non-conductive structural backsheet comprises electrical vias. A structural egg-crate core comprises a grid of core strips coupled to the non-conductive structural backsheet and is configured substantially perpendicular to the non-conductive structural backsheet around open boxes. A non-structural grid of antenna feed cards is configured substantially perpendicular to the non-conductive structural backsheet and crosses the core strips. A non-structural grid of antenna feed cards comprises intersections configured within the open boxes, and electronic feed-lines aligned with the electrical vias. Antenna array unit cells comprising antenna cards coupled to the non-structural grid of antenna feed cards and configured to fit within the open boxes.