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If the antenna is on your roof, then you want to make sure the antenna is at least about 4-5 feet above the level of the roof. This helps to make sure that the antenna can perform the way it is supposed to, without being influenced too much by the roof itself.
Beyond that, adding more height will usually not make a huge difference. In a few special cases (like if you're blocked by a nearby building, tree, or hill), it might help to get the antenna higher to clear the obstruction. However, in most cases, the nearest obstruction is so far away (perhaps a mountain a few miles away) that adding another 5, 10, or 15 feet to your mast will make almost no difference at all.
The Sutro channels are blocked by a pretty high mountain range. Out of the three main transmitter clusters available to you, Sutro has the weakest signal. To get these channels, you really need to have the antenna on the roof, and the antenna needs to be pretty big to pick up stations at this level.
If you were thinking of having the antenna indoors, then I'm afraid that it's pretty much out of the question. Almost all of the Sutro channels are in the "red" zone of your TV Fool report.
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