The PMM Narda RA01 is designed to provide a good solution to measure low level fields from 9 kHz to 30 MHz (RA-01) and 150kHz to 30MHz (RA-01-HV)
It is a good companion of all receivers or spectrum analyzers to cover lower bandwidth application.
Each antenna is individually calibrated. By knowing the actual antenna factors and performance characteristics of an antenna instead of typical data, you can more accurately calculate the field strength in your tests.