Making a list similar to this for all your stations should help you decide which places really need a radio. When you have reached this decision then draw a geographical map to scale showing the locations of the proposed radio stations with respect to the HQ station. Join together with a straight line the stations which are to speak directly to each other. Write beside each line the number of kilometres it represents, see the example in Fig.4.1. Let this be your basic plan for the future network.
Short-Wave Radio Handbook
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