My new 31fs has the same thing on the dash. This may infact be the XM/Sirius antenna. When I installed the old XM unit in my jeep it had a similar antenna.
When we get our unit back from Ford due to an airbag warning light, we can look at it more.
Carl & Dawn
2015 Greyhawk 31FS
2015 Ford Transit Connect (our TOAD on a DEMCO Dolly)
DW, DSx2, DDx2 Catx2 Dog
Tampa Bay Area of FL