Wow, Sprint has been working hard on upgrades in Madison. When I checked this map last month (https://network.sprint.com/search/53711/) they had about 12 updates showing, now 54.
The insanely-dedicated people at S4GRU (http://s4gru.com/index.php?/topic/1983-network-visionlte-milwaukee-market-including-madison/) have detected LTE at various places around town as Sprint seems to be testing new equipment.
nice… they need to get that south west corner hit now