increasing Unit's attack Range?

I'm sorry if this has been asked before, but how do you increase the attack range of a unit beyond its maximum?

An example would be like a Cannon Tower has a maximum range of 800, while in the editor you can raise it to the full range 20,000 but while in-game the range will stay at a max of range 800 regardless of the setting made in the editor.

There are maps I've seen with Units and Buildings having a Range of 1000 to 20,000. How is this possible?

hm..maybe that were owncreated units. with another programm or somethin like that. or it was fixed with a trigger. don´t know.

A unit cannot shoot further than its idividual sight range.

Oh, the Aquisition Range must be of the same or more distance of the Attack Range, ok. Thanks man.

with the aquisition range setting u can actually make a unit have different ranges throughout a game

what does aquistion range do?