Radio Frequency coverage models are visualized by displaying three dimensional unity scaled models of antenna performance in a Geographic Information System, Traditional logarithmic scaled antenna models are converted to linear models and stored as three dimensional representations which are placed and scaled using a GIS to visualize RF coverage. The linear vibrating device includes a conductor line meandering in a wave-like shape along the surface of the diaphragm, and magnets disposed in opposed relation to the conductor line. The substrate can also include a boundary region such that the plurality of chopped carbon and glass fibers in the substrate are substantially mixed in the boundary region. A plurality of ink ejecting members is positioned in respective nozzle chambers. The voltage clamp may also include a second current source and a third current source for providing sinking capacity to the driver circuit to prevent the voltage on the electrical interconnection from rising above the other known voltage reference level.