There's no doubt that companies spent a ton of money in the FCC's latest wireless auction -- $44.9 billion of it, to be precise. But who was it that was so eager to part with their cash? You don't have to wonder for much longer. The FCC has revealed the winning bidders, and there's little doubt as to who the frontrunners are. AT&T was by far the biggest spender. It shelled out almost $18.2 billion for 251 licenses to use that coveted AWS-3 spectrum, or nearly three times what it spent on 700MHz frequencies back in 2008. Dish, meanwhile, made its broadband ambitions pretty clear by snapping up a sizable $13.3 billion in airwaves.