English NTSC TV's.

[ppppenguin]

Originally Posted by wa2ise

Tall towers, that the UHF DTV transmitting antennas are mounted at the top of, tend to sway in the wind. This sway can be as much as a good fraction of a wavelength of the carrier frequency up on UHF. That, combined with some significant ghosts, can make the conditions at a receiver be constantly changing. Which adds extra fun in receiver decoder design...

I think that's only a problem for 8VSB where the equaliser has a lot of work to do. The speed at which the top of the tower moves isn't high enough to give doppler shift that would trouble any plausible COFDM signal.