A banner 6 would look more than likely like this


xx
ox
xx

Where the o = the standard bearer, the x's his radius of influence. I don't know if it leans more forward or backward with banners (Fear is forward), but it would stand to reason that it leans more forward, though I don't know how far 'wide' a banner goes.

I believe Firbolgs have Standard +20 so that would be a good one to test.