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Everything about antenna gain that Electron said is true. However, let's look at your requirements.
Our basic premise is providing a noise margin (read the Signal Analysis FAQ that's linked on your report) at the reciever of 15 or so dB to protect against the odd propagation conditions that are not handled by propagation models. All the Waco stations have noise margins of 40 dB or more. That means you have 25 dB or more to give in signal strength before running into trouble.
At the very worst case, you could lose 20 dB by being in the attic, plus lose 3 dB or so in the cable down to the TV. We're still good! You don't need to max out on antenna gain. The HBU-33 will be perfectly fine.
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