"Louis Rota was very secretive about his work and published very little."
Understandably, they are also found very little, actually nothing.
"Rota did not use any electronic equipment, only a stop watch and a hight impedance headset connected to a ground or/and aerial antenna network."
As first amateur radio enthusiast did, and found many times the same "theluric" effect. Metal rods in soil work as weak battery, metal rods in air collect atmosheric, airflow and environment charge and this is all of thelurity.