No, it's just base attack + "maximum targets". Not 1 more for having barrage or something like that.1st your barrage will fire 4 rockets.
1 for your base attack
1 for having barrage
and 1 for the "maximum targets" i believe.
The only thing i see that COULD be wrong is "Techtree - Check Dependencies".
Also what is the problem?
Ok, then that tutorial is obviously wrong.Read that.
Thats where i saw it from...