It is a microwave backhaul (high bandwidth over long distances), but as pointed above, requires line of sight.
I am assuming that it is a taller tower, typically microwave backhauls aren't installed on short towers.
Although it isn't 4GLTE, if it is a Verizon tower, there is a good chance that they will add lte antennas soon. Lte antennas are larger rectangular shaped(skinnier ones are 1x voice) , but could be confused with 3g antennas as they look similar. Still, I doubt that Verizon would expand 3g at this time, so if you see them start putting up rectangular panels, then most likely lte
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