Just wanted to confirm this weapon's range is the 4 range band to infinity, not beyond range 4 to infinity... ATST player last night was convinced he couldnt shoot a mortar at my troops within range 4. Thanks

You're correct. AT range 4 or farther. Can't hit Range 3 or closer.

Don't forget an infinite range band doesn't mean you get to ignore los requirements though. You still need to see the unit.