Visibility is crap on Endor, horrible horrible game design. Very unfun.
On PS2, I can take it out with a Vanguard. It takes more missiles than you have, unfortunately, but there are two Gonks right outside the bunker. You have to shoot directly at the 'flag generator', and supplement your rocket assault with concussion grenades. But if you can survive long enough to reload (or have a friendly Pilot nearby to reload you), it only takes two 'rounds' of rockets to reduce it to rubble.