Spectral throw

Anyone know how I would make it so this ability will cast at range instead of running up to the first mobs face and then casting it?

 

Code:

Cast("Spectral Throw", obj => (PoEObject)obj, ret => TargetList.First().Distance < 25 )

you probably have to work on the distance I have no idea of it's distance.

 

the distance increases every level up of the gem but i just added it as lightning arrow.