Would replacing the WiFi antenna fix my iPhone's terrible reception?

Backstory, my iPhone has always had very bad WiFi reception. It typically only connects to networks with three bars, occasionally two. Up until recently, I've been able to deal with this since I wasn't on my WiFi much anyway.

At any rate, I've recently decided I'd like to fix the issue. My phone is out of warranty unfortunately, so an Apple replacement is not the answer.

This part:

http://www.ebay.ca/itm/iPhone-5-5G-Wifi-...

appears to be what could be causing my issue.

I've been fixing iPhone 4 and 4S for years so I'm relatively comfortable, I'm just not sure if it's worth attempting if it's unlikely to fix the problem anyway.

Has anyone tried this repair in order to fix chronic WiFI issues on an iPhone 5?