Tv antennas receive the best at the front of the antenna. And smaller antennas also receive good at , front angles , back and back angles. With the least amount of reception on the sides of the antenna. (Big antennas also have the least amount of reception on the sides of the antenna).
I recommend aim the ANT751 antenna at 132 degree magnetic compass direction.
For the best reception of XHDTV-DT UHF channel 47 MyNetwork.
And this puts the 2 main groups of Digital Tv stations at angles to the ANT751 antenna.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The ANT751 antenna is being used as a UHF channels 14 thru 51 antenna for this reception situation.
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Install a Winegard YA1713 VHF high band channels 7 thru 13 antenna aimed at about 315 degree magnetic compass direction.
This will put the YA1713 antenna at a in between aim direction for reception of , KFMB-TV channel 8 CBS , KGTV-DT channel 10 ABC at a front angle and put KSDX-LD channel 9 at a front angle to the YA1713 antenna for better reception of KSDX 9.
The YA1713 antenna can be adjusted direction for the best reception of , KFMB , KGTV-DT and KSDX.
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The 2 antennas are connected together with a UVSJ = UHF/VHF Separator/Joiner.
Type the letters - uvsj - in the
http://www.solidsignal.com , search box.
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Digital tuners can develop - Digital Glitches - that are not cleared out with a simple channel scan.
Do a Double Channel Rescan.
http://www.dtv.gov.rescan.html.