To fire a barrage, first take a Barrage template (see 1.0.1) and place it on the table where you want the barrage to land. Each weapon contributing to the barrage must be within range and have a line of fire to at least one unit under the template. Weapons that are not in range or do not have a line of fire to an enemy unit that falls under the template may not fire at all this turn. You are allowed to place templates over your own units, or units from several enemy formations if you wish but all units under the templates – friend and foe alike – are attacked. Any formation that is attacked receives a Blast marker for ‘coming under fire’ (see 1.9.4). Next, refer to the data sheet to work out the total number of Barrage points. The whole formation fires at once, so the number of Barrage points for each weapon that is in range and has a line of fire is added together. When you have worked out the total number of barrage points refer to the barrage table below. Note that a formation may only fire one barrage per turn – a single formation may not fire separate barrages at different targets.

The 30cm example is a bit confusing with minimum range.

Can a Barrage template be placed over units that can't be seen? Or over units that are out of range?

Yes, each weapon contributing to the barrage need only have a line of fire and range to a single unit under the first Barrage template. Extra Barrage templates do not require either condition, and an indirect fire barrage does not require a line of fire.

Can a Barrage template be placed completely out of range?

Extra templates certainly can, and the first Barrage template can in certain circumstances (a unit that is partially in and partially out of range for instance). The Barrage template can be placed over any part of a unit (even if that part is out of range) so long as part of that unit is in range. A line of fire is still required to this unit, unless it is an indirect fire barrage.