Loop antennas are low frequency loop-shaped antennas used for measuring electro-magnetic fields. Due to the design of a loop antenna, it is practical for use in EMC applications where measuring radiated emissions is important. In order to have a complete test setup for radiated emissions it is useful to have a preamp operating at the same frequency range as the loop antenna, as well as a spectrum analyzer. With this test setup, analyzing test results for radiated emissions allows for meeting certain test standards specified by FCC, CISPR, MIL-STD and EN.