Sony DAV-S400 Operating Instructions Manual page 20

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If you have poor FM reception
Use a 75-ohm coaxial cable (not supplied) to connect the system to an outdoor FM antenna as shown below.
Outdoor FM antenna
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 ground wire to a gas pipe.
GB
20
System
Ground wire
(not supplied)
A
AM
N
T
E
N
COAXIAL
N
FM
A
75Ω
To ground
DAV-S400 4-240-074-12(1)