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This paper proposes a new signal-injection technique which utilizes the earth wire that is present in the electrical system to reduce electromagnetic-interference (EMI) radiation from indoor broadband power-line communication (PLC) networks. The new signal injection method is compared with the typical signal-injection technique used in PLC modems today. The method is also compared with an alternative signal-injection technique proposed by other researchers. For a balanced network, the proposed new signal-injection technique allows for a significant reduction in the level of radiated electric field of up to 40 dB in the frequency range from 1 to 30 MHz when compared to the typical signal-injection technique. The feasibility and practicality of using the new signal-injection technique for the reduction of EMI radiation are discussed.