Before installing a second antenna.
Install the ANT751 above the roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , north west , west , south west , south , east.
Digital Broadcast Tv Tuners can develop -Digital Glitches- that are not cleared out with simple channels scans.
Do Double Resacan ,
www.wchstv.com/DoubleReScanAlert.pdf