The comparison of a loop antenna factor measurement has been performed. One of the motivations for this comparison was that since the last comparison in this field (CCEM.RF-S21.F), several National Metrology Institutes have implemented the calibration capabilities for antenna measurements. The second motivation is that the loop antennas are typically working over a large frequency range, in this case 10 Hz to 30 MHz. For the calibration over this frequency span, two ranges are distinguished: the low frequency range where Alternating Current (AC) techniques should be used, and the high frequency range where Radio-Frequency (RF) measurement techniques are applied. The comparison shows that the participants were able to measure within the declared uncertainties.