Hello. blu; welcome to the forum.
KLRN - 145 deg, PBS, real channel 9
KSAT - 141 deg, ABC, real channel 12
KABB - 141 deg, Fox, real channel 30
KENS - 141 deg, CBS, real channel 39
WOAI - 141 deg, NBC, real channel 48
The first two are on VHF-High, so you will need a VHF-High/UHF combo antenna like the Winegard HD7694P.
http://www.winegard.com/kbase/uploads/HD7694P.pdf
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our house will have a metal roof, so I'm unsure if an attic antenna would work.
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A metal room will block the TV signals.
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Another thought is to have the builder build us a "dormer" on top of the roof, that looks decorative but can also hide our antenna inside of it.
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That might work if the window faces in the direction of the transmitters. A metal screen or lowE glass will block TV signals.
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2: Do you think any type of amplifier/booster would be needed, or any additional equipment?
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According to your report, probably not unless the trees are in the signal path; they also block TV signals. Try it without a preamp first. If one is needed, I suggest an Antennas Direct Juice preamp.
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3: How high up do you think we need to mount the antenna?
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Ideally, high enough to clear the trees. Your report doesn't state a height, so it is at the default height, which I think is 10 feet.
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4: Any chance we'll be able to make attic-mount work, or will it need to go on the roof?
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Outside is always better. No chance without the dormer, fiberglass skylight, or through the end like vinyl siding. The dormer is the best for inside.
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5: Do trees have an impact on the signal we will receive? There are a good amount of oak trees around us.
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Yes, they cause a lot of signal loss, especially when wet.
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6: Since all our needed channels are in the same direction, I don't see a reason to make the antenna motorized/rotating. Do you?
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No