Measured Earth Attenuation for LF-VLF Far Field Signals at One Site

This presents a summary of the results of measurements of through-the-earth attenuation to received LF and VLF signals at one site. The loss represents, on a communication link basis, the excess loss incurred by Placing the receiving antenna underground instead of above the earth's surface. The results of this test indicate underground receiving antennas are practical at these frequencies.