“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.