Richard Harrison wrote,

I worked for years in shortwave broadcasting and have yet to see any
facility which employed vertical transmitting antennas. I`ve heard there
are some verticals, but when serious investment is professionally made
in shortwave transmitting antennas it is nearly always made in the
horizontally polarized variety.

Best regards, Richard Harrison, KB5WZI


Medium and Long Wave, on the other hand...
73,
Tom Donaly, KA6RUH