[BC] Any manned transmitter sites left?

[PeterH5322]

> I'm curious if there are any stations today that still have manned
> transmitter sites or is this truly a relic of a bygone era?

So-called "critical" AM arrays are or were required to be manned.

One station of note spent ten years of engineering time on eliminating 
this designation.

The old "multiplication method" array wasn't stable. The new "optimized" 
array is.