Total posts : 45366
Another hunch-(not on interference, but on propagation).
In reference to the SQUIRE story previously in this thread, I reprise the ponderation of an elevated installation using a copper nail driven 20 – 30ft up in a tree as a ground..
It may sound silly (and maybe it is), but if a tree can indeed be used as an effective antenna, then it seems just as plausible that the same type method could ground your transmitter.
If so, it doesn’t seem an inspection would classify a live tree trunk as a radiating ground!