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The graph is actually for the field strength in uV/m, not the voltage applied to the antenna terminals of the receiver. Not including “/m” in the graph was an error. An impedance-matched lossless half-wave dipole in free space at about 100 Mhz has an effective height of about 1m, making a field strength of 1.9 uV/m produce about 1.9 uV across the antenna terminals. This is a unique situation where the field strength and the applied voltage are numerically about the same. In most cases, the effective height is not 1 m, and the field strength and applied voltage have different numerical values.
Incidentally, the “effective height” is not the same as the length of the antenna.