The 20-25 degree downtilt invalidates your theory that this is about backhaul. Even accounting for the 217' of elevation differential between Cupertino and Milpitas such an antenna downtilt results in the signal hitting the ground within a few hundred yards from the tower. Moreover for backhaul you'd want a much narrower beamwidth.
Betteridge's law strikes again.
Biting the hand that feeds IT
