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The paper describes two alternative approaches to conventional screen room measurements for determining radiation from electronic equipment and the susceptibility of equipment to continuous wave and pulsed electromagnetic fields. Details of EMC measurements performed using the two techniques: (1) use of underground mine tunnels (low-Q enclosure), and (2) use of TEM transmission cells, are given along with a brief discussion of factors influencing the measurement results. The TEM cell is particularly high-lighted because of its potential for making accurate (= or < 1-2 dB for radiated susceptibility at levels up to 600 V/m, and 3-5 dB for radiated emission at levels down to 10 microvolts/m) measurements with a minimum of additional equipment.