By "wonderful reception prediction", I mean that you have many strong, line of sight signals that should be easy to receive. If you are having trouble, one of the first things to consider is, 'is something in the way?' Attic construction varies, and makes the top of the list of things that may cause reception trouble.
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Are you saying that some locations don't work in an attic?
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Sort of... More precisely, I'm saying that some attics are terrible reception sites. This can be due to metal in the roof system, insulating material, plumbing or heating/cooling ducts. An extra layer of shingles may be the proverbial straw that breaks things. Even a nice attic will weaken signals passing into it, and there will almost certainly be higher levels of electronic noise in the attic, originating from appliances, computers and similar devises in the home.
An antenna such as the Antennacraft HD850 or Channel Master CM-3016 pointed SE should provide excellent reception if not blocked by trees or structures. If you have no interest in receiving any signals in the range of real CH-2 through CH-6, an even smaller antenna could be suggested.