Solarcon MAX-GPK I-Max 2000 Ground Plane Kit
The MAX GPK used with the I-max 2000 is intended to lower the angle of radiation for a slight increase in range. I have read that it slightly reduces sky-wave interference on receive. In summary and to save you some time from looking around the internet I've seen mixed reviews and test data stating no noticeable improvement to slight improvement. In theory it should give a slight improvement on transmit and receive.
Solarcon MAX-GPK. Ground plane kit for the Imax2000.