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On AM and FM radios, the interference is characteristically heard as a buzzing noise, whine or hiss. It affects both mains- and battery-operated radios.

Depending on a material's thickness and composition, it might blockor interfere withradio waves.However, aluminum foil, and other electrically conductive metals such as copper, can reflect and absorb the radio waves and consequently interferes with their transmission.

The wavelength of FM radio is around 3m and therefore comparable to the size of a typical human. This means your body may be refracting the radio waves. The proximity of your body may be causing changes in the inductance of coils in your radio and therefore changing the tuning.

RF signal fading is caused by several factors including: Multipath Reception, Line of Sight Interference, Fresnel Zone Interference, RF Interference and weather conditions.

For half-millimetre-thick tin foil, radiation above about 20 kHz (i.e., including both AM and FM bands ) would be partially blocked, although tin foil is not sold in this thickness, so numerous layers of tin foil would be required to achieve this effect.

Steps to Reduce Radio Frequency (RF) ExposureReduce the amount of time spent using your cell phone.Use speaker mode, head phones, or ear buds to place more distance between your head and the cell phone.Avoid making calls when the signal is weak as this causes cell phones to boost RF transmission power.More items...?Feb 10, 2020

A change of aerial height may also reduce the effect. A higher performance aerial can help lessen interference caused by nearby radio transmitters. If you have an aerial amplifier, use the lowest gain amplifier needed, to avoid possible system overload caused by the nearby transmitter.