vaderios said:

The antenna will be up in a mountain/hill. it makes sense after all. The bunker can be in plains

-Angel

Or in essence the base of the hill, with the shield antenna being up on top of a hill (doesn't necessarily have to be a mountain, just higher up away from the rest of the forest).

I also really love the idea of the entire forest being set on fire from the fire fight between the Imps and the Ewok/Rebels. Maybe the Ewoks could have homemade explosives or chemically volatile rocks that they use as arrowheads and grenades to help even the odds (could also better explain how they can pierce the stormtrooper armor - though I am aware of history and what the English longbowman did to heavily armored French knigits. Let's just say it didn't end well for the French)?