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The VHF low band channels are 2 thru 6.
http://en.wikipedia.org/wiki/KJWP.
http://en.wikipedia.org/wiki/WPVI-DT
http://en.wikipedia.org/wiki/WACP.
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The tvfool channel list columns shows the Real Channels that are Transmitted and Received and the , Virtual Number.
An example and not the only example is , WCAU , Real UHF channel 34 , virtual number , (10.1).
http://en.wikipedia.org/wiki/WCAU.
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The Current Tv Channels that are being transmitted and received in the , USA , Canada , Mexico , are ,
VHF low band channels 2 thru 6.
VHF high band channels 7 thru 13.
UHF band channels 14 thru 51.
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As to installing a antenna in the attic , I can not recommend it , I back away , because of the 1 and 2 edge path obstructions in the directions of reception.
However as always you are free to any install any antenna at any location.