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Is there any antenna specifically for high VHF that's better than the Antennacraft Y10713?
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It's the highest gain 7-13 antenna remaining on the market.
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If I add everything up that antenna has a gain of 16.5 db which is great..
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No, the antenna's gain is stated as 9.4 dBd on the specification sheet.
On high-VHF, the PA18 averages about 1.7 dB noise figure and about 19.6 dB gain. RG6, at high-VHF frequencies, should have a loss around 2.75 dB/100'.
Keep in mind that those transmitters have power outputs less than half of the power of the light bulb(s) in your refrigerator (door open). Plus, that energy is focused mostly at the horizon. At your depressed angle of elevation relative to the transmitting antenna(s), you may find that little signal is even sent in your direction before considering the effect of the terrain blockage.
The TVFool calculations, in your case, are little more than "guesstimates". Until you actually put an antenna up in the air and experiment with it's aiming direction, you'll be pretty much flying blind.