diagonal lines and distortion - DirecTV DVR

#1
For diagonal lines and distortion, relating to DirecTV DVRs and receivers. I see diagonal lines that vary from straight to out of control wavy at different times and at times clear up. I see this on two different TV's that are each connected to different recievers of the same type. It seems to me, the only thing in common is the antenna. I have a 100% signal strength when I check. I checked out all of the connections and all seem tight and clean.
Thanks for your help, JH
 
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