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Originally Posted by upks
KHQA-DT and WGEM-DT.
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KHQA CBS is on real channel 7, and WGEM NBC is on real channel 10; they are VHF-High channels.
It is the real channel number (also called physical channel or RF channel) that determines what antenna is needed.
VHF-Low, real channels 2-6
VHF-High, real channels 7-13
UHF, real channels 14-51
The virtual channel number (like 5.1 or 5-1) is a holdover from the analog TV days to maintain the identity of the station, and is what the TV displays. By convention, the virtual channel number is given in the decimal form to keep it from being confused with the real channel number.
The Solid Signal HDB91X is a good antenna for UHF channels, but it is a poor antenna for VHF-High channels. They gave you bad advice.
https://www.solidsignal.com/pview.asp?p=hdb91x
Their title says:
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Xtreme Signal Yagi Outdoor HDTV Antenna 70 Mile VHF/UHF (HDB91X)
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but the description says:
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It receives UHF from more than 70 miles away, and up to 25 miles for high-band VHF.
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which means that it is only good for very strong VHF-High signals.
The description says:
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Xtreme Gain
With a maximum gain of 16dB, it doesn't get much stronger than this. If you have weak channels, a high gain antenna like this is your best bet.
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but their gain chart shows a higher maximum gain. Note that it only shows UHF gain; no VHF-High gain shown.
Maximum gain 23 dB? I doubt it.
It's hard to believe what they say, because it comes from the marketing department, not from an engineer.
You need to add a VHF-High antenna and combine it with your HDB91X using a UVSJ UHF/VHF combiner (AKA Diplexer}, or replace your HDB91X with an antenna that will get UHF and VHF-High.
VHF-High antenna, Stellar Labs 30-2475:
http://www.newark.com/stellar-labs/3...vhf/dp/48Y8141
a little more gain, but bigger, Stellar Labs 30-2476:
http://www.newark.com/stellar-labs/3...vhf/dp/71Y5462
UVSJ combiner:
https://www.antennasdirect.com/store...Combiners.html
or a UHF/VHF combo antenna to replace your HDB91X:
Winegard HD7698P
smaller version with less gain; might not be big enough:
Winegard HD7694P
The least expensive option is to add a VHF-High antenna to your present antenna, but you would have two antennas to mount.