Note that the simple coaxial cable with ungrounded shield performed the poorest. The better performing cables had circuits in which the 100 Thevenin source resistance was not tied to ground. Although Ott’s evaluation was focused on evaluating the shielding from a magnetic field, his system also produced an electric field. Caution should be used in over-generalizing his results. Many subtle factors contribute to the pick-up of coherent interference, including circuit geometry, the frequency and the spatial distributions of E and B fields.