Sal M. Onella wrote:
. . .
What's the record for max BCB power?

Dunno, but some of the SW BC stations sure are impressive. I had the
opportunity to see the Deutsche Welle facility at Wertachtal, Germany a
couple of years ago. It has, I believe, 12 ea. 500 kW transmitters, and
the antenna consists of several miles of curtain array with reflector
grids on both sides for reversibility, arranged in a pattern of three
long radials from a central building. It can also be electronically
steered to some degree. Modulation could be heard at about a half mile
from the antenna, apparently from vibration of some of the antenna feed
components. That facility leases time to many other international
broadcasters.

Roy Lewallen, W7EL