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by walrus01 1716 days ago
The entire lower white donut ring around the bottom of the CN tower is a radome, inside are ptp microwave dishes. It was a lot more relevant in the era before singlemode fiber went everywhere.

Looks like this inside.

https://www.jagelectromagnetics.com/images/jag_cataloug_imag...

Nowadays there is some 2.0GHz band ENG stuff up there for live news gathering stand ups.