“T V I” means Tele Vision Interference.
The most common causes of TVI are bad powerline insulators, poorly designed LED bulb circuits, poorly designed transmitters. And, sometimes, the receiver is just overloaded by a nearby strong transmitted signal.
I think I found another source of TVI when I stopped in Douglas, Wyoming and spotted this.
It’s just a cellphone snapshot, I wish I had a better image for you. But in the center of the image you can see a UHF television receiver antenna…. and it is mounted directly to the radiating element of an 11 meter CB transmitter antenna.