Hey, there! They may... or not. Proximity is a big factor: You have a challenge ahead if the nearest firs are right up against the house. If they're more than 100 yards away, don't lose any sleep worrying about it.
One great feature of the 91-XG is its dual boom, which is calibrated to allow tilting of the UHF antenna upward. UHF is where trees would have their greatest impact on reception. You'll want to tilt it so as to aim just above the tallest ridge between you and the stations, anyway; tilting also helps the antenna "see" signals coming in from above the trees. The trees won't be as much of a hindrance to reception of VHF channels 7, 8, 10 and 12 as long as you experiment with placement of the YA-1713 -- backwards/forwards, left/right, higher/lower -- to find the best spot before settling on a mount point for the antennas.
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