How to signal for help if my radio fails?

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Visual Signals Visual signals are often the most effective way to alert rescuers from a distance. Create a smoke signal during the day by building a fire and adding green leaves or wet wood to produce a thick, white smoke. This type of smoke can be seen from far away and is more likely to be noticed than a standard fire. Use a mirror to reflect sunlight towards any potential rescuers during the day, aiming for the brightest part of the sky.
Audible Signals Audible signals are essential for alerting rescuers at night or in low-visibility conditions. Use a whistle to signal that you need help, as it can be heard from a distance of up to two miles. The International Red Cross recommends using a whistle with a frequency of 5,000 Hertz, which is the most audible frequency for rescue teams. To signal distress, use a specific pattern of three short blows on the whistle, followed by a pause, and then three more short blows. Repeat this pattern until you are rescued.
Amplifying Your Signal Amplify your signal by using any available materials to create a makeshift flag or beacon. Tie a brightly colored cloth to a long stick or use a brightly colored plastic bag to create a visible signal. At night, use a flashlight or a headlamp to create a beam of light that can be seen from a distance. If you have a pair of binoculars, use them to signal that you need help, as the lens can reflect sunlight or moonlight towards any potential rescuers.