has anyone experienced this problem?my Mitsi HDR-5 DirectTV rcvr.performs perfectly when viewing over the air local station digital hd programming.satellite locals,digital and HD reception are ok . problem is only with the analog reception of local over air stations.the picture is of a scrambled,distorted, nature,wiring connections seem ok,have rebooted rcvr several times,checked all settings etc. suspect rcvr internal malfunction?could a defective diplexer cause this problem?would appreciate any advicel