The wavelength of Radio 4 FM, transmitted at 92.5 MHz, can be calculated using the formula wavelength = speed of light / frequency, resulting in approximately 3.24 meters. In deep valleys, the terrain obstructs radio waves, leading to significant signal loss due to diffraction and reflection. The shorter wavelength of FM signals makes them less capable of bending around obstacles compared to longer wavelengths. Consequently, listeners in these areas experience difficulty receiving the broadcast. Understanding these principles is crucial for addressing radio reception issues in challenging landscapes.
