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Let me answer this! It’s something I actually know the answer to. And they said “that’ll be the day.”
In the SSTran AMT3000 Manual, Page 18, Board Jumper Options, tells us that S2 and S3, when installed, provide an RF ground path through the transformer into the building wiring.
Oh wait…….. you are on batteries…….. but you might play with removing and re-inserting those jumpers, because the wire to the battery will provide some small ground plane.
Also, with S1 installed the audio negative side becomes part of the transmitter ground.
I may not have helped, but for that one second while I thought I knew something it was magnificent.