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Both 'have' and 'had' been are forms of perfect progressive tenses. 'Have been' being in the Present Perfect Progressive form is an action that began in the past and continues to happen in the present, and 'Had been' in the Past Perfect Progressive form which is a past ongoing action that was completed before some other past action. Used in a sentence...

I have been reading this book since this morning.
I had been watching tv when he arrived.
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On my own thoughts about these is that Have been mean you been waiting to one place or done doing something while had been is that your still going to do or still on going while doing it.
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