This standard by the international electrotechnical commission is currently in its second addition and foursomes on transverse electromagnetic (TEM) waveguides. It further breaks down these structures into one, two, or multi-port TEM categories. IEC 61000-4-20 has five main objectives, provide TEM waveguide characteristics, validation methods, EUT definition, and testing for radiated emission and immunity. The objective is not to provide exact testing requirements for immunity and emissions but provide a ground work for testing. For emissions testing limits reference CISPR standards, for immunity, reference related standard within equipment scope. We offer a variety of test equipment including amplifiers from IFI and Teseq.