A professional would avoid the attic if they could. Results are very un-predictable anywhere inside a building. Results are barely predictable outside.
TV signals, UHF especially, are blocked and otherwise interfered with by anything in-between the transmitter and the antenna.
You may find a good spot in your attic, or not. It's all trial and error for inside a building.
You are correct put it in a place and aimed the way you think will be right based on your TVFool report and scan the channels. Move and repeat as necessary.
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