Hyundai TUCSON Hybrid Owner's Manual page 338

The following conditions are normal and
do not indicate radio trouble :
Fading - As your vehicle moves away
from the radio station, the signal will
weaken and sound will begin to fade.
When this occurs, we suggest that you
select another stronger station.
Flutter/Static - Weak FM signals
or large obstructions between the
transmitter and your radio can disturb
the signal causing static or fluttering
noises to occur. Reducing the treble
level may lessen this effect until the
disturbance clears.
Station Swapping - As a FM signal
JBM004
weakens, another more powerful
signal near the same frequency may
begin to play. This is because your
radio is designed to lock onto the
clearest signal. If this occurs, select
another station with a stronger signal.
Multi-Path Cancellation - Radio
signals being received from several
directions can cause distortion or
fluttering. This can be caused by a
direct and reflected signal from the
same station, or by signals from two
stations with close frequencies. If this
occurs, select another station until the
condition has passed.
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