Usage patterns
〈物〉が〈数〉基あるthere are [number] units of [installed object] (gravestones, lanterns, turbines, satellites, etc.)
There are two stone lanterns in the garden.
〈物〉を〈数〉基設置するto install [number] units of [equipment] (using 基 as the counter)
They installed five wind turbines on top of the mountain.
Expressions
に基づきbased on; on the basis of 基本のきthe absolute basics; the most fundamental thing