[TowerTalk] When was the first tower & beam used?

[Jim Lux]

here's a real tower question...

When did hams start to use a directive antenna on a tower with a 
rotator? I'm thinking after the 40s.  The Yagi wasn't invented til 
the late 20s, and wasn't widely known until after the war.  The W8JK 
was probably around the same time.  The cubical quad was in 1939 at 
HCJB, but that was probably not rotatable.

Perhaps about the same time as LPDAs were used for TV.

Jim, W6RMK