Improving monopole radiated emission measurement accuracy; RF chamber influences, antenna height and counterpoise grounding (CISPR 25 & MIL-STD-461E vs MIL-STD-461F)

For many years, the automotive industry has used a monopole antenna to measure the radiated emissions from modules at frequencies ≤ 30 MHz. Over the past few years, the chamber to chamber measurement deviation of the monopole antenna measurements has become a topic of concern. Studies have shown that significant chamber to chamber measurement deviations, as large as 20dB, may exist when making monopole measurements in an ALSE. Recommendations to modify the absorber lined shielded enclosure (ALSE) have been made in order to improve the measurement deviation. However, requiring all test laboratories to modify their ALSE(s) is not practical. MIL-STD-461F recently changed the monopole antenna setup (antenna height and counterpoise grounding) in order to improve measurement deviation. Should the modified MIL-STD-461F monopole antenna setup be adopted by the automotive industry for the next revision of CISPR 25?