When miking an upright bass, the goal is to get a good balance between the full tone of the body (lower frequencies) and the attack generated by the fingers on the strings (higher frequencies). A great place to start is with the mic about 15″ from the body, at a height between the bridge and the bottom of the neck. Aim the mic at a point between the strings and the sound hole, addressing the instrument at a slight angle. Adjust to taste.
For added ‘snap’ (attack) add an MA-100 or MA-101fet pointed at the fingerboard.