Abstract
Reinforcement bars arranged longitudinally around an antinuclear cylindrical shelter are treated as coupled dipole antennas and are shown to provide shielding against EMP which is a maximum at the shelter center and drops steeply towards the ends unless the reinforcement is continued into the end caps. Depending on dimensions, a low frequency electric field parallel to the cylindrical axis can be shielded by a factor of the order of 10 to 35 dB or more.
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