A communication system electromagnetically communicates beyond the electromagnetic barrier created by a physical barrier. First pre-existing electrical AC power distributing infrastructure extends on one side of the physical barrier and has electrical conductors and AC outlets. At least one first communication subsystem is located at the one side of the physical barrier and is connected to the electrical conductors. At least one second communication subsystem is located at an opposite side from the first side of the physical barrier. The first and second communication subsystems each have a first handheld transceiver radio, a second transceiver radio, a radio-to-local-area-network converter, and a power line Ethernet adapter. At least one electrical conductor extends the electrical power distributing infrastructure on the one side to the power line Ethernet adapter of the second communication subsystem on the opposite side of the physical barrier. The cost-effective system is made of commercial and government off-the-shelf components.
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