Test pattern explanation....
I’m sorry to know exactly what it was. That means I’m old.
The antenna had to be facing just right to get the test pattern to look that clear, and the adjustment knobs had to stop the picture from flipping upward over and over.
But we got to watch the classic shows and news was on for 30 minutes, tops——with no Don Lemon or Rachel Maddow. Unless Walter Cronkite broke in to tell us somebody else just got assassinated.
And no matter how well you adjusted the antenna, the image would wiggle, wiggle, wiggle every time an airplane went over...
I can remember my dad climbing up in the roof to adjust the TV antenna. We had a procedure where he would point in in what he thought was right direction, I would run into the house and see what it looked like on our black and white TV. Then I run back out and yell to him better or worse. This would go on a few times. Then it was good until a good wind storm would redirect the antenna. [end of story]