A single antenna such as the Winegard HD8200O or HD7084P, or the Channel Master CM3020 would cover the bands that your individual antennas cover, and these antennas compete with the gain performance of your existing antennas. If all signals of interest are originating from the same direction, a single antenna may makes sense, but when you need flexibility in aiming, separate antennas may provide a better solution.
If you are chasing after a weak signal, and it happens that you've got a strong FM signals nearby, you may find that a separate FM antenna and related cabling helps avoid problems with FM interference to the TV signal(s).
There's not a one-size-fits-all answer to this question.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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