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If your TV has a signal strength indicator, you may be able to use that to dial in a little better. Let you iPhone get you in the general direction. Then call your wife who's inside watching the signal and she yells, 'Getting hot! No, no, go back, colder!" Some TV's aren't as good, others have some nice bar charts & meters to help you fine tune it. But as long as the signal isn't dropping out, you're good. Of course, weather, leaves, etc can bring that about sooner if you aren't setup optimal.
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