Non-line of Sight solutions: Reflecting board.
Passive reflecting board redirecting a 5.8Ghz signal in middle of a 3 mile path with extremely good results. 3′ parabolic antennas are directing a 200mw signal in a 6˚ beamwidth.
We have also redirected a 2.4 Ghz signal with satifactory results in Ettersburg using a precision flat 7′ x 8′ aluminum board reflecting a signal from a 120˚ sector antenna.
These solutions will have to be engineered on an ICB (individual case basis) and you can figure on a minimum of $2000. You are always welcome to come up with your own solution.