Subaru STARLINK Manual page 129

FM
Fading and drifting stations: Generally, the effective range
of FM is about 40 km (25 miles). Once outside this range,
you may notice fading and drifting, which increase with
the distance from the radio transmitter. They are often
accompanied by distortion.
Multi-path: FM signals are reflective, making it possible for
2 signals to reach the vehicle's antenna at the same time. If
this happens, the signals will cancel each other out, causing
a momentary flutter or loss of reception.
Static and fluttering: These occur when signals are blocked
by buildings, trees or other large objects. Increasing the
bass level may reduce static and fluttering.
Station swapping: If the FM signal being listened to is
interrupted or weakened, and there is another strong station
nearby on the FM band, the radio may tune in the second
station until the original signal can be picked up again.
TIPS FOR OPERATING THE AUDIO/VISUAL SYSTEM
AM
Fading: AM broadcasts are reflected by the upper
atmosphere — especially at night. These reflected signals
can interfere with those received directly from the radio
station, causing the radio station to sound alternately strong
and weak.
Station interference: When a reflected signal and a signal
received directly from a radio station are very nearly the
same frequency, they can interfere with each other, making
it difficult to hear the broadcast.
Static: AM is easily affected by external sources of electrical
noise, such as high tension power lines, lightening or
electrical motors. This results in static.
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