I am looking to see if what I am trying to do is even possible. Is there an antenna powerful enough that I can connect with to regular WiFi networks that are hundreds of meters away. If it is sensitive enough wouldn't it be able to capture and send packets to many meters away? Is it going to be easy to create a channel and communicate normally? Would the connection be too slow or have any downsides such as static noise?
The most powerful ones that I dealt with first hand that were still impressive were the Ubiquiti Long Range devices. We were able to link from device to WAP from 150m away (I know this isn't the plural "Hundreds of meters", but perhaps it can give you a starting point and this particular WAP, I actually witnessed holding solid at 200Mbps as opposed to reading a spec and repeating it here).