Yes, some TVs have two separate antenna inputs. If you need analog as well as digital just buy a two-way splitter, it really does not matter what splitter you buy, all two-way splitters basically have the same losses.
My guess is you may not need a preamp unless you have a very long cable run, but you won't know until you get the CM4228 on top of the mast - OTA reception is mainly driven by the height of your antenna. The fact you are splitting the signal makes the need for a preamp more likely.
With the CM4228 you won't get the analog stations at channels 2 and 6 and probably not the one at channel 11 either. You may get some digital stations that antennaweb isn't showing you, it is very conservative in its estimates for digitals.
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