As feedback on my earlier post above, so far so good on the Stubby Jr. antenna from CravenSpeed. I don't listen to AM/FM very often, but I tested it out for a bit on several different stations and found no real noticeable signal difference.
I'm also quite happy with the look, for now at least. While I still think the sharkfin is the nicest look this is a close second, for me at least. (especially on a black car) When I bought the car I assumed that a sharkfin was in the near future, but I think I'll try this out for a while and see if I can live with it, as it's far more cost effective.
For what it's worth, the customer service people at CraveSpeed were amazing! They quickly answered all of my questions (I had several) and in the end told me that any of their antenna part numbers beginning with CRMC-0705 would fit the '17 Fusion. With this information and due to availability issues in Canada, the Stubby Jr. I bought was for the Ford Escape (2013-2018). Perfect fit!