Mon Calamari central planetary scanner mast

This huge structure was present on the planet Dac that was used to monitor the planet surface.

History
Around 21 BBY, during the Clone Wars, this planet became the site of a battle between the Galactic Republic and the Confederacy of Independent Systems. Although the CIS overwhelmed the Republic, Anakin knew that the Jedi High Council were sending reinforcements so he destroyed the scanner mast using the Force ensuring that the CIS commander Riff Tamson would be oblivious to the Republic reinforcements.