star wars - Why did the Rebel fleet not bombard the Shield Generator on Endor?

Once the Rebel fleet showed at Endor there was no need for stealth operations.

Soon after arriving, the Rebels discover the stealth mission was not successful and begin a battle over the moon of Endor.

Why did the Rebels not use their ships to attack the shield generator?

Looking a the hologram displayed on Home One, the shield only covers Death Star II, not the moon. Furthermore, the shield generator's location on the Moon would not be hard to find as it had to be within the proximity of Death Star II and stood well above the tree line. It seems that even a few X-wings, B-wings or Y-Wings could have made short work of the Tower.

One possible answer is that the Tower was also protected by a shield. Okay, but they would not even attempt to bomb it?

Perhaps the location of the strike team was unclear and they did not want to risk the lives of the Strike team. If this was the case, why did they not target the tower or the dish to disable the shield projector unit?

Answer

Based on the graphic we saw earlier in the film, the shield appears to also cover the Endor Shield Generator Station. This would make an aerial bombardment of the moon as ineffective as an attack on the Death Star itself.

At best you might be able to devastate the jungle a few dozens of miles away, killing the indigenous, but leaving the station unharmed.

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You may also wish to note that the film's official novelisation states that the Endor Moon has its own planetary shield, also projected from the Shield Station.

At the center of the briefing room was a large, circular light-table, projected above which a holographic image of the unfinished Imperial Death Star hovered beside the Moon of Endor, whose scintillating protective deflector shield encompassed them both.

_{^{Return of the Jedi - Official Novelisation}}