Note:
This antenna is not suitable for making absolute measurements of field strength, however it can be very useful for determining the frequency of RF sources and for making relative measurements of amplitude (e.g. to determine the effect of a modification on the amount of signal radiated at particular frequencies)
For absolute measurement of amplitude at a specific frequency, a calibrated antenna will be needed.
For accurate field strength measurements over a wide frequency range, a set of calibrated field probes will be needed.
These are available from specialist suppliers.