You must be sitting right on the doorstep of the building where the array is situated. I wonder what difference an antenna would make, burnout your UTD?
If you are seriously considering an antenna go here, XXX
Before I did that test I thought I was +_1km away in a straight line, looks like I am a little further as I said and I can't see the tower or array from my window even though I am upstairs.
Plenty of trees and some buildings in the tower direction as well as a tree +_1.5m from my modem between it and the tower.
Some day I will try an antenna to see if the signal improves not that I think it will make any difference to the speeds I get.