To KI6BLP.
Vladimir, please be informed that "Dear Spin" never answers for any concrete question...
As far as I know there is radio station on the air in El Salvador on 700 kHz. They say that it runs 12,000 watts and provides excellent coverage. The cylinders are almost 1 meter in diameter and almost 6 meters in length. The bandwidth of this antenna is 26 kHz for 2:1 VSWR.
As about me, I am not shure that it's truth... You have a chans to check it!
Best regards! - Schoolboy