A power estimator for a Code Division Multiple Access receiver. The front side of the box which can be positioned flush with the installed wall covering includes fittings for attaching a wall plate, switches, plugs, connectors, and electricalelectronic devices to the box. An earth battery may also be included, at least partially contained within the real estate sign and supplying power to the real estate sign. The lower surface includes a gasket and a number of protrusions. At the proximal end is a head having a diameter greater than a major root diameter of the central section.