Silica-based low dielectric constant materials having three-dimensional network structures containing siloxane backbones which comprise SiO4 tetrahedron structural units, as well as their production and use. The signals can be two signals experiencing cross polarization interference or signals that experience interference from other satellite signals. A register 33 stores a count value. The panel is embossed to resemble a brickwork pattern, and the marginal borders vertically traverse the pattern through vertically aligned joints in alternate courses, the flanges having similarly arranged projections to be received within the spaced depressions presented by the aligned, vertically spaced joints. In the first surface treatment, a coating liquid that contains at least one selected from the group consisting of boric acid and borate is applied followed by being dried and solidified.