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Combining 2 antennas is hit or miss, sometimes it works as planned, sometimes it no different than one, sometimes it makes things worse. The sad part is, no way to predict which one you will get, you have to try it and see.
Also a vertical stack makes the vertical aiming very critical, as it makes a very narrow beam width in the vertical direction. You will need a method of adjusting the vertical angle in 1 degree increments to fine tune it.
I would take a small TV attached to a long extension cord up in the lift with you to use to fine tune your aiming. It's critical you get it right since you won't be able to get back up there again.
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