A “Cantenna”: improvised antenna, reused materials, can extend transmission and reception of a variety of radio devices – a paint or other metal can, plus copper wire or brass rod, brass tubing – can extend the range of radios, cell phones, wireless networks. Here’s one example from Wikipedia’s entry Cantenna:
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We’ve been casting about for two-way radio vendors – and sophisticated advice. And found, for our purposes, an amazing oufit in FastRadios.com – based in Naples, Florida – but they sell at very competitive prices and on very competitive terms (extended warranties, for instance, on batteries as well as radios). After a long conversation with [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.