How to create range indicator spheres

[MIRAGE]

So I'm working on an anti-air custom unit, and want it to display its range bubble when selected, just like missiles. How could this be accomplished?

[321k]

I don't know any 4rpl command that creates this kind of bubble. It's just not yet implemented for 4rpl, I think.
Workaround could be a prim sphere with a half transparent texture. But that's more sphere like, not so bubbleish.