Was on my way home from work last night with the LTE Discovery app running on my Galaxy S4 when it picked up LTE on Highway 145, near Carmen Ave. Here are the exact coordinates: 43.12308178, -88.01644458, which is about 1.5 miles from my home. So it is getting close I couldn't check in Sensorly.com tonight how close a 4G signal has been detected to my home, but last I checked it was just starting around 68th and Silver Spring.
Now, if I could just get the LTE by work, where I need it since we don't have wi-fi through out the whole building, I'll be a very happy Sprint user.