I'm actually beginning to think it is a capacity issue. My signal happens to be fairly consistent (3 bars or higher). But the bandwidth is the problem. I had to come to work early at 5AM and I was able to get about 2-3Mbit download, but after an hour, it went down to ~0.5Mbit and it stays that way pretty much until 8PM. Fort Huachuca area does have a work community that grows and shrinks by 10k people on a daily basis and I just think that maybe the tower is overworked.

I tested the tower just outside Fort Huachuca, 1.5 miles away in area code 85635 and I was immediately getting 35Mbit download speeds.