Yes using a UHF/Combo VHF Antenna for Mr Cootha (original one fitted years earlier) and a UHF Only facing north for Northern Towers. Now that I know that its not a 24/7 issue I will try to record what our house (hope its not an Neighbour issue) is doing during the issue.
Thanks for your reply. I need to accurately monitor this issue as I'm not home all the time but today all day Channel 9 has been perfect on all tv's. Yes Spot on no signal fluctuation none whatsoever on the Signal strength or quality but when its bad its bad. I could be some sort of local interference causing this issue. I was thinking it was our hot water Tariff 31 relay doing this but I observed it coming on about 1 PM today (our Hot water was already up to temp thanks to Solar HWS so no juice was being used) and Channel nine and its sister channels were ok.
I'm starting to think this is a local issue as I would expect if I was having conflict from other Towers I should have the issue all the time. Trouble for me is I can't be at two places as the same time and for this stuff I cannot rely on my family.
I finally got to play round with a 65" LG B6 today using 4K test slides and various other content.I put the TV in THX bright room mode for the test.I'm happy to report that i could not find any inconsistency in the image whatsoever with either light or dark content and colour graduation slides look very smooth.I have no HDR content but UHD,1080P and 720P content looked lovely and natural.I like the stand on the B6 better that the edge to edge soundbar of the signature series to as you don't need a stand as wide as the TV.When the price drops low enough i recon this is my new main display.