Based on the TV fool plot you posted, to get KNTV (NBC) Real 12, you would need a very long high gain antenna. For a channel 12 Yagi, to get a NM of 10 (insurance against bad weather and such), you would need 20db of gain, which would require a 100’ long antenna. Just to get out of the hole, and get a NM of 0, you would need a 50’ long yagi.
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