Sony HT-C800DP Operating Instructions Manual page 23

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If you have poor FM reception
Use a 75-ohms coaxial cable (not supplied) to connect the system to an outdoor FM antenna as shown below.
System
Outdoor FM antenna
ANTENNA
Earth wire
(not supplied)
AM
y
To earth
Note
If you connect the system to an outdoor antenna, ground it to protect against lightning. To prevent a gas explosion,
do not connect the earth wire to a gas pipe.
GB
23