FM radio signals travel somewhat directly to your radio from the radio station transmitting tower. Anything that comes between the two will interrupt reception. Going through a tunnel in a car illustrates a temporary example of this type of interference. Many of the radio stations that come in clearly on a car radio are not able to be picked up inside a steel building. The process of improving indoor reception is one of trial and error, but it can be done cost-effectively.
Relocate the radio. Try several different locations to find a spot within the steel building that offers the best reception. Placement near a window generally offers the best chances for picking up FM stations.
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Identify the antenna and move it into the best path for clear signals. Home clock radios without a telescopic antenna often have a thin wire attached that operates as the antenna. Some simply use the power cord. Change the position of the antenna to find the best possible placement for a clear signal.
Attach an upgraded indoor antenna to the radio. Connect a dipole antenna, or an old pair of TV rabbit ears to the antenna terminals. Attach the u-hooks to the antenna screw terminals. Find the best location in the building for that antenna to pull in FM radio signals.
Turn the "Stereo" selector switch to "Mono." Although FM radio stations broadcast in stereo it is more difficult for a receiver to pick up a clear signal in stereo. The mono setting will eliminate two-channel sound, but it will reduce static and fuzz from the incoming signal and deliver more powerful sound output.
Use an outdoor antenna if nothing else improves the radio station reception in a steel building. Electronic suppliers sell aerials that resemble old rooftop television antennas. Mount the antenna outside as high as possible and connect a coaxial from it to the antenna terminals on the radio receiver.