During one of many discussions about AT&T's wireless network shortcomings a few weeks ago, a handset executive anonymously told the press he felt that AT&T would need to spend an additional $10 billion on backhaul to get their network up to snuff. That of course doesn't address coverage -- and AT&T's 3G network coverage continues to lag industry-leading Verizon. TownHall Investment Research tells IDG News that AT&T also needs to spend about $5 billion to extend broadband coverage. AT&T's taken heat lately for soaring wireless revenues, that aren't being matched by network investment, something Townhall's Gerard Hallaren agrees with:Apparently it isn't just satirists and fake CEOs who are noticing that AT&T's making a killing, but not putting adequate funds back into the network. Again that's great for investors (AT&T's entire reason for holding full investment back), but not so great for those who'd actually like to complete a phone call while walking down Fifth Avenue.