Aim the HD7698P antenna at about 145 degree magnetic compass direction.
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim antenna.
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The Tv stations you will like to receive are very weak signal strength.
Antenna aiming is important.
The starting aim direction is 145 degree magnetic compass direction.
The antenna aim is adjusted for best reception.
Most Digital Tv's have a signal strength meter and some Digital Tv's also have a signal quality meter.
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Install the HD7698P antenna above the roof in such manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , South East , South , North West.
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Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do Double Rescan ,
www.wchstv.com/DoubleReScanAlert.pdf