Get the antenna Up in the air so reception is not impeded and blocked by the roof and building in the directions of , North East , East , North West , West.
Try aiming 1 panel at about 52 degree magnetic compass direction.
And the other panel at about 267 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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Digital Tv Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
Do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
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How is the reception now??
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It is a good idea to rescan from time to time because New Tv stations/channels can begin transmitting at any time with No advance notice.