The Trango 900 is only rated at 400mw, the SR9 does 700mw.I wouldn't count on an indoor rubber duckie going more than a few hundred yards - a mile is unrealistic in my opinion.
I have marginal signal at my desk with trango 900 11 db ap to a su with 10db patch at 0.25 miles both with 26dbm output and -98 receive sensitivity.
I'd scratch that idea
Scott