Occasionally when setting up the tv in poor reception areas I found that twiddling an adjuster screw on the signal amplifier removed the pixelating and improved the picture a lot. I only found this adjuster screw by accident when the amplifier cover fell off. It is difficult to spot and tricky to adjust in it’s deep recess in the cover. So I have now removed the cover made a bigger hole that the adjuster screw protrudes then pushed a short length of plastic tube over the screw. Now I can easily see and make adjustments to the tv picture.