Ford 2013 Flex Owner's Manual page 546

WARNING: Changes or modifications not expressively approved
by the party responsible for compliance could void the user's
authority to operate the equipment. The term "IC:" before the radio
certification number only signifies that Industry Canada technical
specifications were met.
The antenna used for this transmitter must not be co-located or
operating in conjunction with any other antenna or transmitter.
2013 Flex (471)
Owners Guide gf, 4th Printing, December 2012
USA (fus)
Appendices 545