You should be aware that anywhere that a ground rod is installed, that there may be AC voltage/current/frequency in the vicinity of it.
— Steven MageeStray voltage/current/frequency is the most serious form of exposure. Electrocution kills very few people per year. Stray voltage/current/frequency exposure is suspected to be making people sick in the millions!
— Steven MageeElectrical earth (ground) cables are all energized with radio frequencies (RF). Generally the further away from the ground rod you go, the more RF that you will find.
— Steven Magee