Correction to "Received Voltage Versus Antenna Height"

In the above paper [ibid., vol. EMIC-11, pp. 104-111, Aug 1969] the caption of Fig. 6 should have read as follows: "Fig. 6. LP spiral anteinna; source height 1 meter, distanices 61 meters. MIeasured received voltage versus antenna height, transverse plane polarization 200 to 1050 MHz."