Smoke Signals and Primitive Communications
For some of our more exciting games, we use Motorola Sport 7 radios, an out-of-production version of the Talkabout FRS radios that are so popular now. Supposedly you can get a 2 mile range out of the things, but that'd probably have to be in near-perfect conditions (inside the factory?).
I've heard about teams using VHF radios that require federal licenses for their games. This is definitely more expensive, but at least you don't have to worry about crossover from other people's radios in the area.
Here are some other suggestions for the agent of limited means:
Homing pigeons - It is often claimed that the first homing pigeon was the dove released by Noah, but the sport of racing homing pigeons is of more recent vintage. And no, the homing pigeon is not extinct -- that is the passenger pigeon! Pigeons have been used as message carriers for centuries, but in the 1800s a sport evolved, not over the issue of whether a bird could home, but how fast it could negotiate the distance. By the late 1800s there were races in regularly conducted competitions in the United States of America as in Belgium, Holland and Great Britain. How do homing pigeons navigate?
2 tin cans and a string - When you pull the string tight and talk into one of the cans of your tin can telephone, the sound vibrates across the taut string to the other can.
I am also a big fan of the US military field phones. Since they need a pair of wires (stereo wire works fine) stretched between them, it gives your games the added WWI realism of having to go and check the line if the wire is cut.
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