The image at the very top of the article mentions they have a microwave backhaul (see "E"), which I'm assuming goes to another ground location (i.e. a central office.)
Actually this makes better sense than what I was guessing about cell towers below. So, what I'm imagining is these temp towers will make sure that you can get connected.
I think ATT is a tier 1 network, so your connection to whatever data center will probably get bonded directly to whatever ATT datacenter which has the fastest response (ping) to the content your connecting to...love to see a traceroute for comparison.
