From Pikipedia, the Pikmin wiki
The Sulking Antenna (むっつりアンテナ?, lit.: "Sullen Antenna") is a treasure in Pikmin 2 and is really an old TV antenna. This enormous treasure is found on Sublevel 5 of the Glutton's Kitchen, usually in an alcove. While moving it, make sure to deal with the Dwarf Bulbears and Armored Cannon Beetle Larvae that may get in the way. After the delivery cutscene, the analysis screen will show the treasure from farther away than normal, given its size.
“Utilizing the unique abilities of the yellow Pikmin, we breached the electric gate. This allowed us to access a previously uncharted subterranean wooden structure. The last time I was here, I never noticed their capacity to dissipate electrical charges. Perhaps they have other undocumented behaviors and abilities...”
“Amid the noise of the world, this healing antenna will produce a quiet evening just for you. Exciting radio programs? Fun TV shows? They're all shut out because this antenna does not receive any type of electromagnetic wave. Its sullen behavior is for your own good!”
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