ETS-Lindgren's Model 6511 Passive Loop Antennas have a frequency range of 20 Hz 5 MHz and are designed for both EMC emissions and EMC immunity tests. All loop antennas can be individually calibrated in accordance with ANSI C63.5, using NIST traceable equipment. By knowing the actual antenna factors and performance characteristics of an antenna instead of typical data, you can more accurately measure field strength in your tests.