Many tower climbers historically jumped onto AM towers (usually at lower power levels), and they still felt little shocks climbing the tower. Even if the tower

Many tower climbers historically jumped onto AM towers (usually at lower power levels), and they still felt little shocks climbing the tower. Even if the tower is off, if it's near any other sites, they can draw a significant amount of RF (as a good AM tower is a good AM antenna) and if it's not grounded, that RF will go through a person too! This specific tower site doesn't require lights on the shorter towers, so it's not an issue here, but for sites with lights needing replacement, most nowadays turn off power to the tower and ground it before anyone climbs the tower.