Lossless compression techniques provide efficient compression of hyperspectral satellite data. The AV content information identifies AV content stored in association with each of the group of web-based servers. A diplexer is connected between the first and second antenna and the control unit to couple signals from the transmitter to the second antenna but not to the receiver and to couple signals from the first antenna to the receiver but not to the transmitter. In order to achieve this operation, the initial phase relationship between the components may be selected to offset dispersion induced phase changes between the transmitter end of the link and the selected location. The authenticating step may be based on detection of an event-related potential in the obtained electroencephalographic response.