Antenast stand tall and rigid, sending mysterious signals across the sky. They each have their own unique set of broadcast frequencies, which can be listened to in unison or as separate tracks. When recorded from radio receivers, the resulting sound is a chaotic yet melodic clutter of notes and noise. Patterns are clearly audible in Antenast's broadcasts. Some frequencies have been spectrographically analyzed to reveal images of the landscape surrounding a specimen to fractal images and strange patterns that appear to be some form of written language. Other sound patterns have been parsed and demonstrate a charted slope similar to human language according to Zipf's law. Other sounds are regular mathematical rhythms constructed based on powers of two.
These Ultra Beasts tend to spend the vast majority of their lives rooted in the same spot. They are slow-moving, so if the land runs out of critical nutrients, they're likely to wilt and die rather than move on. Fresh, charged land must be close by for an Antenast to survive its migration. Because of their low mobility, they are especially well-adapted to living in poor soil. Their roots reach long and deep through the ground to pick up as much electricity and minerals as possible. The roots can quickly retract into the legs, but the legs themselves are quite stiff, forcing them to move slowly. Towards the base of their legs are large battery packs to keep them from starving should the soil run dry of electricity.
Antenast are most at home in flatlands and storm-stricken deserts, where there is minimal risk of toppling over. A fallen Antenast cannot right itself and is forced to make do with the soil it can reach in its prone state. Some Radrazelit are fond of Antenast's signals and will help one up if they see it on the ground. Xurkitree have also been seen pushing Antenast back into standing positions, following up with dances and a synchronized light show. Broadcasts from these events possess patterns perfectly matching the lights of their rescuers. Captured Antenast can also be taught to understand and communicate using human language and familiar song structure. With the confirmation of Antenast's intelligence, translation work on signals recorded from wild specimens has risen in priority.