Apparatus, methods and articles of manufacture for multiband transmitter power amplification are provided wherein one or more amplifying devices, of which at least one may be one or more current sources, have impedances matched for different input and output frequencies by way of various impedance matching circuits. The job, or the copy, is transmitted to a designated destination. All of the functional units are connected to each of the internal busses so that each of the functional units can read from and write to all memory locations. The inner bore may receive the support member and include a groove extending from the first axial end to the second axial end. The application and the supporting software are encapsulated in a single virtual file to create a virtual appliance that is independent of hardware and dependent only on virtual appliance support. A visual display support means is attached to the upper ends of the legs and includes pivotal clamp frame means for clamping a display sign, poster or other visible sheet in position on each side of the display means so that the device can be positioned between rows of vending or gaming machines to provide visible access of the display to users of either row.