·Time Warner Cable
...in ideal conditions, with no one else on the tower. Gee, thanks for setting unrealistic expectations (I've hit 35.6M down, 13.5M up with absolutely no one else on a sector, at maximum modulation in both directions).
Realistic speeds for the time being, when you're within a few miles of an LTE tower (not 3G, not WiMAX) are around 15M down, 5M up. Upload speeds will be lower than on AT&T or Verizon, generally speaking, because upload channels generally aren't congested and you have twice the bandwidth there to start with...well, AT&T doesn't in Chicago but 700MHz also travels farther so you can actually modulate at 16QAM wherever.