[Twan]

A +10 standard give +1 morale to all units in a 10 radius *each round* so in round 2 the units still at range will still have +1 morale (+1 -1 +1), when the units out of range will have +0.

With 5 standards, the units in range would have +5 morale and the units out +4 the first round out of range, +3 the second, etc... So better to use several.

edit : if my interpretation is correct