What does this mean?

Today, I, was scouting a Tower in my area, when I came across this Warning sign. It’s written here in German, that „to climb the tower, it’s mandatory to shut down, sector two of the transmitters“, (underlined with red marker in the first picture) what does this mean? Is it really necessary?, Or do they mean it’s necessary when you just to go infront of the transmitters (look at the first picture on the lower side), also on the ladder protection there are certain safety distances measured… What does they mean? Thx