Schemes for detecting UXO or land mines have been in great demand for a very
long time (50% of casualties in the 1960s in Southeast Asia were from mines).
It's a "very hard" problem.
I'm looking a bit deeper - consider skin depth at HF is "meters" but not
"hundreds of meters".
I'm looking at stuff like "coupling between antennas that are close-ish"
(fraction of wavelength to several wavelength)
On Wed, 4 Mar 2026 08:21:16 -0800, Brian Beezley <k6sti@att.net> wrote:
N4OGW said:
"What is usually used is the 'Slingram method'."
Thanks for mentioning this, Tor. Quite a bit of research seems to have
been done on the method. A good search term for HF devices is
HFEMI sensor
Here's an article about correcting errors in a configuration that uses a
VNA:
https://tinyurl.com/4naansm3
Several articles mention the detection of unexploded ordinance. An
unexpected bonus when you measure the ground constants of your back yard.
Brian
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