Volvo 2005 C70 - Manual (Page 201)

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Audio systems, general information
FM stereo reception
Stereo reception places very high demands on
the signal quality which means the type of
distortions previously mentioned become even
more obvious. The signal strength needs to be
stronger for good stereo reception and this
limits the effective range of the sender.
We hope that this information proves to be
useful and provides you with a better
understanding of the problems related to car
radio reception.
Reception conditions are not always optimum
and this is, of course, beyond our control.
However, we have endeavored to make the
Volvo Audio System of a quality that will
enable you to enjoy the best possible reception
no matter what the reception conditions may
be.
Radio antennas
NOTE: Always lower the antenna when using
an automatic car wash or entering a garage.
The antenna should be cleaned at least every
15,000 miles (24,000 km) or more frequently
if needed. Use WD40 for cleaning.
Spray the antenna with WD40 and wipe it
clean and dry with a rag. Spray it again. Lower
and raise the antenna. Wipe it clean and dry
again. Lower and raise the antenna 4-6 times.
Make sure it is dry and free from dirt or
lubricating oil.
Diversity antenna (dual antenna
system)
Certain models are equipped with the optional
Diversity dual antenna system. Two antennas
are connected to the radio through two
separate sockets, allowing for better reception
and reducing the effects of static or multipath
distortion of FM reception.