You want to know how many men are in that camp. You will never see them all at once. So you count the latrines instead.

Field sanitation is planned, not improvised. The number of latrines in a camp has a direct numerical relationship to the number of troops being served. Nobody digs more than they need, and nobody digs fewer. That row of structures at the edge of the treeline is a headcount that nobody thought to hide.

The kitchen answers the same question from a different direction. A field kitchen is manned and equipped to feed a specific number of soldiers — not an approximate one. Watch the queue. Then look behind the kitchen at the stack of empty crates, because that pile is a record of how many were fed yesterday, and the day before.

Then there's what people carry. Lightly equipped soldiers moving without packs can be assumed to be close to their operating base. Men heavily laden with packs and equipment are redeploying somewhere new. Same track, same direction, two completely different reports.

And routine. Every army eats on a schedule, and in a particular order. Three sittings instead of one means they feed in shifts — which means they work in shifts, which tells you something about how the position is manned around the clock. Who eats first tells you who is standing guard while the others eat.

None of this is dramatic. It is exactly the kind of seemingly unimportant information that turns into real intelligence — and the kind only someone on the ground can report accurately.

An enemy is hard to find, but not impossible. Habits and habitats leave definite fingerprints.

A camera sees the latrines. Somebody still has to count them.

Send this to someone who thinks reconnaissance is about spotting tanks.

What's the most useful thing you've ever noticed that nobody else did?

#reconnaissance #recon #army #survival #intelligence

How do you make a wire antenna directional?

A plain long wire talks in two directions at once — forward to whoever you're working, and backward to everyone behind you. You can't rotate it and you can't switch off the back lobe. But you can absorb it.

Here's why it happens. Power runs up the wire, reaches the open far end, and has nowhere to go, so it reflects and travels back — radiating the whole way. That returning wave is the rear lobe.

The fix is a resistor. Connect the far end to ground through a 500 to 600 ohm non-inductive resistor. The forward wave still radiates all the way down the wire; whatever is left at the end gets absorbed instead of reflected. Nothing travels back, so nothing radiates rearward.

The trade is better than it sounds. On a five-wavelength wire at 14 MHz, terminating cuts rearward radiation by roughly 15 dB and costs about 2 dB forward. Shorter wires pay more — a two-wavelength V-beam gives up around 3.5 dB. And the power heating that resistor is power that would have gone backward anyway.

Component choice matters more than people expect. Wirewound resistors are useless here — the winding behaves as a coil at RF. Carbon types are electrically fine but handle only a few watts, so QRP only. Whatever you use needs a rating of half your transmitter output, short leads, and a weatherproof box at the far end. A useful trick: three resistors in series instead of one reduces stray capacitance.

Build notes: one wire, two wavelengths or longer, 3 to 7 metres up, as straight as the ground allows. Good ground at both ends. Below 12 MHz, point the terminated end straight at the distant station.

Save this for your comms binder.
Send it to someone whose wire antenna hears everything from everywhere.
Full comms course on the profile.

#hamradio #radio #antenna #army #recon