No surface, vertical 40 meter antenna was available
to make signal comparisons but comparisons were made with a 40-
meter dipole elevated about 40 feet. On local and short- skip
contacts, the buried antenna was never better than 7 "S"
units below the dipole with the average being 8-9 "S"units.
Buried antennas still offer many possibilities for
experimentation. The main caution to observe is that the length,
impedance and other parameters of surface antennas cannot be used.
Buried antennas are terribly inefficient as compared
to almost any type of surface antenna except perhaps extremely
short, unloaded whips.
But, for emergency communications installations, they
do offer the possibility of having a standby antenna which is
easily installed and which can be pre- tuned and immediately available
for use should something happen to the installation's primary
For those who would like further detailed,
engineering data on buried antennas, the following compilation
of articles is extremely useful: IEEE Transactions, Vol. AP-11,
May.1963. Special Issue on Electromagnetic Waves in the Earth.
IEEE, Box A, Lenox Hill, New York 21, New York.