Most tall towers are aggressively grounded. You would need a tower insulated from the ground. A tower used as an element for a low frequency antenna for instance. I strongly suspect that those large black interlocking rings are used as a spark gap for lightning protection in the absence of a solid ground.
Once you were on the tower you wouldn't notice anything. You would have to get between the ungrounded tower and ground.
The interlocking rings are an Austin Transformer [1]. It's the only way to feed electricity to the aircraft warning beacons on the tower without frying the power supply for the light bulbs.
Once you were on the tower you wouldn't notice anything. You would have to get between the ungrounded tower and ground.