For all those interested, I do not have pictures. They were on a computer that the hard drive was corrupted on and I no longer have them I also sold the phone so taking new ones is not an option either. I'll try to make it as clear as possible though for people to follow. So, a formal DIY will follow in this post.
iPhone 3G/3GS motherboard grounding prong fix:
This worked out really nice for my situation because I fix iPhones quite a bit and as a result I have a lot of random spare parts lying around. You may not have the same resources that I did and if not you will need to be creative. In this case, I used a silver prong from that holds the camera down on the 3G and 3GS model phones. That is the only part you'll need.
The brass grounding prong on my motherboard broke completely off once when I was removing my motherboard to replace the battery. I couldn't find it so I put the phone back together like normal once my battery replacement was done. I noticed a sharp decrease in battery life and this is likely due to Peter's reasoning (accepted answer for this topic). I looked around to try and order the prong to no avail so I decided to improvise. I happened to have an extra camera tab from someone's phone I had that was almost totally smashed. It has a wider base at the end that the screw passes through so I figured it would be suitable to mount in the same arrangement as the brass prong and I would simply have to bend it up in the same orientation so that it would make contact with the inside of the bezel once the motherboard was installed. I cheated a little bit and used super glue at first so it would hold itself in place while I soldered it down. If you cannot solder it down I recommend holding it in place with something small and unobtrusive such as the head of a pen while the motherboard is on a flat surface and applying super glue to the top of the tab. Some runoff will occur and that will be what hold the contact in place. If you do it between the tab and the motherboard contact pad you run the risk of not having an electrical connection. That would defeat the purpose of this DIY fix in the first place. Once I reassembled my phone and fully charged my battery, the battery and antenna performance went back to normal levels. A good preventative measure for this issue is to be careful when installing your motherboard and not allowing that brass tab to get behind the bezel. It will get caught and that is what breaks them. If it does get caught apply some pressure to that lower corner once all screws are removed from the motherboard and it should clear the bezel and free itself. That's all I've got so let me know if there's anything else I can do.