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In page Nike Zeus:

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The entire transmitter was surrounded by a 65-foot (20 m) high clutter fence located 350 feet (110 m) away from the antenna, which reflected the signal away from local objects on the ground that would otherwise create false returns. The ZAR was so powerful that the microwave energy at close range was far beyond the mandated safety limits and potentially lethal within 100 yards (91 m). In order to allow for maintenance while the radar was operating, the equipment areas were shielded in a partial Faraday cage of metal foil, and a metal tunnel was run from the outside of the clutter fence, which blocked the signal outside the fence line. The other radars completing the system featured similar protection.[2]