Range will be shorter at 5ghz. Either way, if it's an urban area, you're probably screwed if you want a reliable connection. Look into bridging with point-to-point fixed wireless. There are even bluetooth solutions you could look into if you don't need high speed.
ETA: I just reread your post and realized that you were asking about what I suggested. LOL. That'll teach me to read the OPs better.
I thought you were looking to connect regular consumer grade stuff.