[TowerTalk] W7PUA Tiny Ground Probe

[Jim Lux]

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 at 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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