making ground units have air sight?

Hey, well im having problems in my map, its an AOS but it has air heros, and the problem is that an air hero can go over a forest and kill ground units without being seen (the weapons are based in fenix fire) so i thought that maybe the solution is to give ground units air sight so they can see over trees, i thought a way to do it, i could use a dummy air unit and make it folow the ground hero, but i realy dont like that idea, is it posible to atleast make it look over the trees without using triggers? (im looking for the less laggy solution.

Thanks!

there is no easy way that I can think of that would not use a dummy unit or a trigger. The way that I would do it would be to make a visibility modifier that moves with created units or you can goto gameplay constants and change it so that attacking units give a los to the attacked unit.

The word is phoenix.

no, something need to be done and that something need trigger, i'll suggest to make a trigger using dummy unit then use the SetUnitX and SetUnitY with a loop

Oh theres a gamecosntant for that? i had no idea, what is it?

I wrote fenix because im from spain, my world editor is in spanish and i didn't know the word in english

Isn't the human tower able to look over trees with his true sight ability? Or does this only work for buildings?
I just saw it in some maps.