You will get the best results when the front of the antenna faces the direction from the which the signals are coming. The C2V has an effective "front window" of around 65-70°. By design, there are directions which contain nulls or dead spots where little to no signal comes in.
Does WPVI (ch 6.x) come in?
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confirmation that I am asking for too much.
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Maybe. It depends on what, specifically you've asked for.
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I notice some channels seem to lock in but do not appear after the scan.
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That means that the tuner detected something on that channel, but the signal is too weak or distorted to actually decode the data.
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There are tall trees in the yard 30 ft. +
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Are they in the signal path?
Intermittent reception of more distant signals is not unusual during certain kinds of weather. Such propagation usually lasts up to a few hours or a day but usually won't be reliable.
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I can possibly go 5 feet higher if need.
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Give it a shot if it's within your capability.