Monotube Mast-Arms in California in 1966

[dbz77]

Here is a picture of Bristol Street in Costa Mesa around 1966.

https://ibb.co/rc30RhW

Note that simple curved monotube mast-arms (without the double-guy attachment) were already in use in Costa Mesa by 1966!

[PColumbus73]

I like the mix of 8" and 12" signals they used to have