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RG-6 should be fine for that distance. To ensure the best quality in the further-away building, I would go from your combiner's output maybe into an RF amplifier, then into a two-way splitter. Feed that splitter's output into the two buildings, with the eight-way splitters in each building.
TV signal distribution is always a matter of gains and losses, and adding gain in advance of the losses when necessary. Your four-way combiner likely adds about 6 dB of loss per channel (or higher if it has more inputs), unless it has an amplifier built in. Two-way splitters add 3 dB of loss, the eight-way splitters will add 9 dB or more, and so on. So, an RF amp with 12 dB or more of gain will compensate for those losses, and also the loss in the cables.
Stick with VHF rather than UHF to minimize losses.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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