If I were in your situation, I would not abandon the CS2 until I had exhausted all alternate mounting heights and locations (including attic and roof top). If I located a mounting / aim combination that produced good results for the real UHF channels but still had poor results on real channels 8 & 11, I would spend $20 on the VHF add on kit.
When you say,
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so the direction I am looking in should not be obstructed by many homes (only a few), instead there are a few trees in the LOS.
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It's unclear which way the antenna is aimed. Is the antenna facing 160° per a compass? If not what direction? Have you tried aiming it other directions?
If you simply want to buy a new antenna, then I would suggest it have High-VHF and UHF capability, and that it be more directional than what you presently have. The Winegard HD7694P fits all of those criteria. Reiterating my previous comments, I would not use any sort of amplifier.
Still, if you aim into trees, buildings, or in the wrong direction, the new antenna will produce disappointing results as well.