The bowtie kits are optimized for the 7-51 channel range, emphasizing different parts of the bands. Go to the site I linked to and read up on it. If the gains match up to what the TVFool NM figures suggest is needed, then you will be fine. If you need double-digit gain at VHF, then this is not an all-in-one solution.
Please ease up on the 7-69 vice 7-51. The people behind the antenna chart know full well what they are talking about. In their judgment, the HD-769x series is the best solution for 7-51. So what if it has gain up to 69? If it has enough gain at 14, then you're OK.
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