John's advise in your earlier thread is correct.
All of the stations in the green section of your TVFR should be viewable with a U4000 as John has suggested. The aim point is not 'cast in stone', but is a starting point... pan left and right to optimize, then tighten the clamps.
In the unlikely event that you have some trouble with channel 12, addition of a Y5713 and a UVSJ would be the backup plan... I don't think you'll need that option.
Stations in the red and gray sections of your TVFR would be challenging because they are weak signals and generally subject to adjacent and co-channel interference. If you want to get into the DX hobby, then your antenna system would be much different.
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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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