English NTSC TV's.

[dtvmcdonald]

As to efficient use of spectrum, COFDM and QAM are identical, **IF**
COFDM uses no guard interval, in which case multipath removal has
to be done using the same methods as ATSC. ATSC is less efficient by a
bit because of the useless lower sideband (using the same coding
for COFDM and QAM as NTSC, of course, which can be done using plain
4-VSB for NTSC and 16QAM for the others including the COFDM carriers.)