No chance of using a chimney mount? Strapped on without drilling holes?
My DB4e in the attic is just about enough for my weakest signal, which is 5dB or so stronger than your strongest signal. And you want KERA (real 14) for PBS, which I don't think you'll get reliably from within an attic even with a DB8e or 91XG. For WFAA (real 8) for ABC, you'll also need a large high-VHF antenna, like the Y10-7-13. But in the attic, it's looking pretty iffy to me.
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