Pontiac 2003 Vibe - Manual (Page 166)

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Your vehicle may have an AM - FM radio navigation
radio system that includes a Radio Data System (RDS)
with program type selections (PTY) that will seek out
the kind of music you want to listen to. The radio
system can also communicate with your navigation
system to broadcast announcements on traffic and
emergency alert communications. For information on
how to use this system, see the “Navigation/Radio
System” supplement.
Understanding Radio Reception
AM
The range for most AM stations is greater than for FM,
especially at night. The longer range, however, can
cause stations to interfere with each other. AM can pick
up noise from things like storms and power lines. Try
reducing the treble to reduce this noise if you ever get it.
FM Stereo
FM stereo will give you the best sound, but FM signals
will reach only about 10 to 40 miles (16 to 65 km). Tall
buildings or hills can interfere with FM signals, causing
the sound to come and go.