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.
Published in:
Communications, IEEE Transactions on
(Volume:23
,
Issue:
11
)
Date of Publication: Nov 1975