Whee, name translations.

[Tsum]

It makes sense to me... >_>

Especially since 'On Air' fits quite well with the 'radio wave' theme that Ryuusei has going on.

 

[Dengar]

Yes, but "to be broadcasting" equals "to be on the air".

I'm guessing they added the "the" to the Wave Change call, for that little extra umph.