Ford 2009 Flex Owner's Manual page 372

Accessories
• To avoid interference with other vehicle functions, such as anti-lock
braking systems, amateur radio users who install radios and antennas
onto their vehicle should not locate the Amateur Radio Antennas in
the area of the driver's side hood.
• Electrical or electronic accessories or components that are added to
the vehicle by the authorized dealer or the owner may adversely affect
battery performance and durability.
372
2009 Flex (471)
Owners Guide, 2nd Printing
USA (fus)