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During modulation experiments with Ramsey AM25C at 1640 KHz using loading coil on an oatmeal box and a 3-meter antenna I also happened to be running SStran AMT3000 at 1680 KHz, with a 3-meter antenna 8-feet apart.
The AM25 antenna received the AMT3000 signal and back-hauled it into the output circuitry where it seriously garbled the audio being generated by AM25. When I ran the AM25 with a silent carrier the audio from the AMT3000 continued being heard on the Ramsey at 1640.
Lesson learned – Strong RF signals intercepted by the Ramsey antenna will play havoc on whatever audio the AM25 is trying to modulate. Because the antenna is so short that could easily include much higher frequencies above the AM band if they’re sufficiently strong.