Gunshots
If somebody's already mentioned this, I apologize, but simple gunshots can be used to communicate over distances.
In Vietnam, VC or NVA trail watchers and tracker teams would use simple gunshots to make other nearby units aware that enemy forces had been detected. They were sophisticated enough to relate direction of travel and unit size. American (and ASAS and NZSAS) recon teams knew that seemingly random gunshots in the jungle meant that they had likely been detected. Apparently some VC/NVA LZ watchers used gunshots to signal "all clear" as well, so one could never be sure what mysterious gunshots meant (unless they were fairly steady, meaning the recon team was being tracked).
I've used this technique a lot for militia/marauder/irregular forces in my T2K PbP.
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