Coh Magnussen wrote:So if I have a Nob with Waaaaagh! Banner following my open-topped grotswagen around, do the gretchin inside the grotswagen get +1 on their shooting rolls? Clearly if he's also embarked they don't, but if he's on the ground hiding behind the wagon?
What is a grotswagen? I assume a battlewagon with Gretchin embarked?
In any case, if you are talking about a unit that is embarked on a transport, they do not benefit. "Embarked units cannot normally do anything or be affected in any way whilst they are embarked. Unless specifically stated, abilities that affect other units within a certain range have no effect whilst the unit that has the ability is embarked."
The banner does not "specifically state" that it affects them.
But all of this is a moot point because a Waaagh banner only affects to hit rolls in the fight phase, not shooting.