No wifi- is there a piece missing from my logic board?

I have an iphone 4 that I'm trying to fix.

It appears to have been worked on before, amd wifi is greyed out.

On inspecting the wifi antenna, I encountered a weird problem- there is no place for one of the screws to screw into!

It's the screw marked in yellow in this photo:

http://guide-images.ifixit.net/igi/diPxJ...

When I removed the plate, I found a hole in the logic board, and a forked piece on the shielding above.

It looks to me like there should be a threaded standoff in between, but there's nothing there.

I've tried to find a photo of this area of the board, but none are clear enough for me to see what this area is supposed to look like.

I've never worked on an iphone 4 before, and I don't have access to another one to examine.

So, my question is threefold:

Is there a threaded standoff or something missing from my logic board?

If so, can I buy or make a replacement, and what is it called?

Is this a likely culprit for greyed out wifi?

Thanks