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This study has discussed the information leakage threat due to the radiated emission of information technology equipment (ITE). This paper focused on the theoretical estimation of the maximum receivable distance for the radiated emission causing the information leakage. The maximum receivable distance estimation formula was theoretically derived based on the reception capacity of a wideband receiver with a specific antenna, the limits of the electric field strength of the radiated emission of ITE regulated in CISPR 22 standard, and the attenuation by the distance in a free space for the radiated emission. In addition, the maximum receivable distance estimation in the considerable worst case was conducted by assuming some realistic parameters for a commercial high-performance wideband receiver and a commercial high-gain log-periodic antenna.