I shall make a correction to your post as both of the sentences you provided are incorrect. Consider the sentence below as the correct form for your previous one:
--> The BBC channel has not been broadcasted/broadcast in our area for over a year. (Like Joe has just said, you must use the construction of the Present Perfect Tense, which is ordered by ''pronoun + have/has + past participle of the main verb'' (in which case is ''been'' - past participle of the verb ''to be''). T
* NOW, if you were to use ''being'' in the context above, then you could rewrite it as: ''The BBC channel is not being broadcasted/broadcast anymore in our area. It's been (over/more than) one year now.''
Hope that helps!!!