Do I need a new cellular antenna?

Hi, my 6 plus fell off the roof while I was working up there and bent the case backwards a bit. It worked without issue for awhile, but today I am not able to use any mobile data unless I am on wifi.

I couldn't remember if I had insurance so I brought it into the AT&T store and asked if I did have the insurance (which I don't) and he mentioned that it seems like the antenna snapped at the top of the phone which sounds quite plausible since that's where the bend is.

Luckily, I have no other issues with the screen or digitize, and the screen was not cracked. I'm hoping if I can replace the back case and the antenna I should be good to go again.

Hoping to get these (ifixit doesn't sell the cellular antenna for the 6plus? Just the 6s?)

Antenna - https://www.fixez.com/iphone-6-plus-top-...

Back Case - http://www.ebay.com/itm/Black-Red-Back-H...

And the cell phone repair tool kit from here.

How does that sound?