NASA NTRS · 19790011925
Active Antenna for the VLF to HF Observer
Abstract
A simple and low cost method of fabricating an active antenna preamplifier system covering the range of 10 KHz to 10 MHz for use with tunable communications receivers is described. The same type of system can be used with airborne VLF navigation receivers. By operating a high impedance preamplifier as a wide band device directly at the base of a short vertical antenna, the signal can be driven back to the receiver on a length of coaxial cable. The antenna can be as short as I meter and still give excellent results when the capacity to ground at the antenna is low.
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Burhans, R. W.. 1979-02-01. Active Antenna for the VLF to HF Observer. https://ntrs.nasa.gov/citations/19790011925
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