Three words could save your life - An app that identifies your location

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On Amateur radio HF (high frequency) Bands, you can communicate with another Amateur radio operator (Ham) for thousands of miles (across the oceans) at night on the 80 Meter (low frequency) and up Bands.

During the daytime on 20 Meters (a higher frequency Band) you can communicate with another Ham, for up to 1000 miles. You would need to have a very good wire antenna strung up at a good height.