OK, it was 48 to 54 MHz, and 50-54 was given to hams as 6 meter band.

Now my thinking gets hazy, but wasn't the OLD FM band 42-48 MHz? If it was,
then the FCC (or was it FRC in those days?) couldn't put any FM stations too
close to TV-1, the same way that today, 88.1 88.3 and 88.5 (and of course
87.9) are not grantable if there's a Channel 6 nearby (82-88 MHz).