Buick Regal User Manual page 25

FM signals only reach about 16 to
65 km (10 to 40 mi). Although the
radio has a built-in electronic circuit
that automatically works to reduce
interference, some static can occur,
especially around tall buildings or
hills, causing the sound to fade in
and out.
The range for most AM stations is
greater than for FM, especially at
night. The longer range can cause
station frequencies to interfere with
each other. Static can occur when
things like storms and power lines
interfere with radio reception. When
this happens, try reducing the treble
on the radio.
SiriusXM Satellite Radio Service
gives digital radio reception from
coast to coast in the 48 contiguous
United States, and in Canada.
Just as with FM, tall buildings or
hills can interfere with satellite radio
signals, causing the sound to fade
in and out. In addition, traveling or
standing under heavy foliage,
bridges, garages, or tunnels may
cause loss of the SiriusXM signal for
a period of time.
Cellular phone usage can cause
interference with the vehicle's radio.
The AM-FM antenna is integrated
with the rear window defogger in the
rear window. Do not scratch the
inside surface or damage the lines
in the glass. If the inside surface is
damaged, it could interfere with
radio reception. For proper radio
reception, the antenna connector
needs to be properly attached to the
post on the glass.
If attaching a cell phone antenna to
the glass, attach it between the grid
lines.