Not that anything in CRTC application documents actually represents 100% certainty, but here
's the proof.
In file DM#1457928 - 2010-1615-5 - APP - CHCH-DT Brief App 2C.pdf
4.3 Feed Source
The studio programming feed will be via fibre
(also see page 18 equipment functional figure #5)
And on page 4 in file DM#1456809 - 2010-1615-5 - APP - CHCH -DT-0 App.pdf
Studio to Transmitter Link (STL) Method: Fibre
In Global's application
, it says STL for Paris is satellite on page 7 in this file: DM#1420742 - 2010-1180-9 - APP - REVISED - APP-Doc2 Form 132 Application Paris.pdf
and similarly, it says "4.3 Feed Source: The studio programming feed will be via satellite" on page 6 of this file: DM#1420748 - 2010-1180-9 - APP - REVISED - APP-Doc6 Appendix 2C Engineering Brief Paris pt1.pdf
I know CKCO Kitchener uses microwave (and it is confirmed in their application) since they were already setup with the MW dishes and line of sight.
As for TVO, I can't find a specific application for the Kitchener site (same tower as Global 'Paris') but I think they use satellite, not microwave, for STL.
Also, just because an OTA transmission site is remote, doesn't mean it cannot be connected with fibre. When space on CBC's St. Agatha tower site was leased by the former Look Communications, that company paid Bell Canada to string fibre to the site, down the dirt roads off Erb St. W. in the township. I suspect ever since Rogers bought the CHUM assets, they have run their own fibre to Citytv's "Woodstock" tower site -- formerly would have been an expensive ordeal since it's on a dirt road in Sweaburg.