I have always received great local reception for channel 6,6.1,6.2, 6.3 ,8 and 12.3, 23.1, 23.2, 57.1, 35.1, 35.2 but as recent as a couple of months ago the picture for certain channels on my TV begin to break up ( little squares would appear, like the ones when I run my microwave). Then reception just stopped. Now I get "no signal" for channel 6, 6.1, 6.2, 23.1,23.3 and 57.1. Any ideas why this would be? I use a very good attic antenna that has not changed. I have check the wire and it is the same.