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The Manual for the SSTran AMT5000 High Efficiency Transmitter says on Page 24, “Ground. A good, low impedance, ground is required for best range. Just as the transmitter will not work without an antenna,it likewise will not work without a ground.”
That’s only the opening statement of a lengthy section describing what a proper ground looks like, and an important instruction detail for correctly setting jumpers inside the transmitter.
Page 22 lists instructions for a whole set of jumpers that have a crtical effect on the transmitters performance.
No mention is made of the grounding aspect of the AMT5000 test, rendering the published test results invalid.