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.