I get the same type of question several times a week, both for indoors and outdoors installations.
When signal forecasts look okay and the appropriate antenna is in use for the problem channel(s), the loss of a single (perhaps more) station(s) that should be received is usually due to either interference from some other device or, most commonly, is due to a frequency-specific reflection that is causing multi-path. The usually corrective action is to 1) move the antenna and try again or 2) go with a more directional antenna that can be adjusted to minimize multi-path.
Sorry, there are no magic bullets available to fix this problem. It takes work and persistence to solve it.
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