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I am using a small VHF/UHF powered antenna located right beside the TV.
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What antenna, by make and model, are you using?
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CJOH-DT (13.1) - the report says I should get this channel quite well
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Yes, it is listed as having about the same strength as the other channels, but it is a VHF-High channel, and the other channels are on UHF. My guess us that your antenna doesn't do as well on VHF as on UHF.
It is the real channel number that determines what antenna is needed.
VHF-Low, real channels 2-6
VHF-High, real channels 7-13
UHF, real channels 14-51
Also, the noise level on VHF is higher than on UHF. You might have some interference to CJOH, even from the TV itself, which is close to the antenna. Also, only 2.660 kW out of 19.000 kW ERP is sent in your direction by the transmitter. You can see the hills in the signal path in the terrain profile. The transmitter is on the left, your location is on the right.
http://www.tvfool.com/?option=com_wr...dALLTV%26n%3d5
The signal loss in the attic is difficult to predict because of differences in construction. A metal roof or aluminum siding will block signals, as will trees and other buildings. I suggest you make a temporary test in the attic before drilling any holes. Try an Antennas Direct DB4e for UHF and an MCM 30-2475 for CJOH aimed at 249 degrees magnetic. The two antennas should be combined with a UVSJ UHF/VHF combiner.
If the signals are too weak, add a Channel Master 7778 preamp.
PBS is going to be more difficult. When you are making your tests, try aiming the DB4e at 139 and 167 degrees magnetic with a preamp. If you get almost enough signal, try a Solid Signal HDBX91 for PBS.
The other US channels will probably only come in with unusual tropospheric propagation.