Thanks for the warning.
LONG ANSWER
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I have been considering hiring someone local with a ladder to help me eave mount it. Since I would be up there and only want to do it once, I thought I might as well get all the channels I can.
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There is no guarantee that location will be any better than your present location. Some testing will be required.
The antenna needs to be in the location where the signals exist, possibly not where you want it to be.
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Now, I'm thinking if I had the antenna up higher I might pull in some of the channels I have trouble with (Tree in front of it) in it's current location.
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You might, or might not.
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I was considering mounting a second 2V in another direction to get those channels that I had to give up.
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There is a good chance that it will pick up other channels that you don't get now.
Can you tell us what channels you get now, by callsign and real channel number, and what channels you would like to get that you don't get now?
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1) Would combing them in series (after aiming them in different directions) then to the preamp be a good idea? (to eliminate using a combiner and another preamp) Or, would that be too much gain? I have a combiner that I bought and never used so it won't cost me anything now.
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It is possible to combine two similar antennas with a splitter in reverse as a combiner, but it doesn't always work when they are aimed in different directions. This is because when the same signals from each antenna arrive at the combining point, they will interfere with each other if they are not in phase. Sometimes it works, sometimes not.
When it doesn't work, there will be some channels missing that you were able to get from the separate antennas before combining.
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2) If the antennas are eave mounted I would have to come up with a way to put them on the same mount. Probably a "T" mount (I will have to construct that). What distance would they need to separated by?
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They could be side-by-side, one above the other, or back-to-back; you haven't given us enough information about the relative directions.
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3) Would an eave mount hold the weight of two 2V's? They are light, maybe 6-9 pounds?
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Probably, if it was a 5 ft mast.
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4) If they have to be mounted to separate preamps then to a combiner...how important is it to use the EXACT same cable length?
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That might not be the best way to combine them. The current for two preamps would have to pass through a special power passing combiner. Will one power supply be able to provide enough current for two preamps? The two cables only need to be the same length when two identical antennas are aimed in the same direction for more gain. Otherwise, it is irrelevant.
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5) Is it best to use the same antenna? I thought it would make things easier signal wise but I'm only guessing at that.
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It would depend upon the signals in the other direction; they might require a different antenna.