One practice which seems common when operating temporary or portable QRP, SOTA, etc., is to throw a counterpoise wire out on the park lawn or shrubbery, mountaintop or hillside or parking lot ground, etc., not buried or wetted, connected to either the (ungrounded) transmitter or an antenna tuner.
So, continuing on with the subject raised about voltages in dipoles, and voltages in beam/Yagi-Uda directors/reflectors, assume an insulated or near-ground counterpoise wire that is roughly a quarter wavelength in length, and a transmitter power in the range of 5 to 10 Watts.
What kind of voltages might appear on such a counterpoise wire?
Does it make a difference whether the antenna is a lambda/4 resonant or non-resonant vertical or a balun-end-fed half wave?
Do these voltages raise any safety concerns?