Transmitters
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| Station | City of licence | Channel | ERP | HAAT | Transmitter Coordinates |
| CIII-DT | Paris | 6 (VHF) Virtual: 6.1 (PSIP) |
4 kW | 311.3 m | 43°15′41″N 80°26′41″W / 43.26139°N 80.44472°W / 43.26139; -80.44472 |
| CIII-TV-2 | Bancroft | 2 (VHF) | 100 kW | 390 m | 45°3′34″N 77°11′59″W / 45.05944°N 77.19972°W / 45.05944; -77.19972 (CIII-TV-2) |
| CIII-TV-4 | Owen Sound | 4 (VHF) | 37 kW | 130.8 m | 44°26′45″N 80°59′59″W / 44.44583°N 80.99972°W / 44.44583; -80.99972 (CIII-TV-4) |
| CIII-DT-6 | Ottawa | 6 (VHF) Virtual: 6.1 (PSIP) |
3.3 kW | 261.3 m | 45°30′9″N 75°50′59″W / 45.5025°N 75.84972°W / 45.5025; -75.84972 (CIII-TV-6) |
| CIII-DT-7 | Midland | 7 (VHF) Virtual: 7.1 (PSIP) |
6.75 kW | 346.7 m | 44°58′14″N 79°46′57″W / 44.97056°N 79.7825°W / 44.97056; -79.7825 (CIII-TV-7) |
| CIII-TV-12 | Sault Ste. Marie | 12 (VHF) | 5 kW | 135.1 m | 46°35′50″N 84°16′53″W / 46.59722°N 84.28139°W / 46.59722; -84.28139 (CIII-TV-12) |
| CIII-TV-13 | Timmins | 13 (VHF) | 25 kW | 176.9 m | 48°28′12″N 81°17′49″W / 48.47°N 81.29694°W / 48.47; -81.29694 (CIII-TV-13) |
| CIII-DT-22 | Stevenson | 22 (UHF) Virtual: 22.1 (PSIP) |
49 kW | 110 m | 42°3′41″N 82°29′5″W / 42.06139°N 82.48472°W / 42.06139; -82.48472 (CIII-TV-22) |
| CIII-TV-27 | Peterborough | 27 (UHF) | 2535 kW | 278.5 m | 44°4′14″N 78°8′35″W / 44.07056°N 78.14306°W / 44.07056; -78.14306 (CIII-TV-27) |
| CIII-TV-29 | Sarnia-Oil Springs | 29 (UHF) | 370 kW | 208.8 m | 42°43′21″N 82°9′59″W / 42.7225°N 82.16639°W / 42.7225; -82.16639 (CIII-TV-29) |
| CIII-DT-41 | Toronto | 41 (UHF) Virtual: 41.1 (PSIP) |
100 kW | 503.0 m | 43°38′33″N 79°23′14″W / 43.6425°N 79.38722°W / 43.6425; -79.38722 (CIII-TV-41) |
| CFGC-TV | Sudbury | 11 (VHF) | 25 kW | 137 m | 46°30′19″N 80°57′33″W / 46.50528°N 80.95917°W / 46.50528; -80.95917 (CFGC-TV) |
| CFGC-TV-2 | North Bay | 2 (VHF) | 3.4 kW | 90.2 m | 46°18′10″N 79°24′39″W / 46.30278°N 79.41083°W / 46.30278; -79.41083 (CFGC-TV-2) |
Studios and offices are located at 81 Barber Greene Road in the Don Mills section of Toronto, the same address from which broadcasts began in 1974. Secondary studio and news bureau facilities are located at the National Press Centre in Ottawa.
A series of rebroadcast transmitters relay the CIII signal to much of Ontario. Most of these use the call sign CIII followed by a number to denote their status as rebroadcasters, except in Sudbury and North Bay where the CFGC call sign is assigned. The most likely explanation for using CFGC is that the close resemblance between the number 1 and the letter I would make CIII-TV-11 an undesirable call sign for Sudbury, while North Bay couldn't use CIII-TV-2 as that call sign is already in use in Bancroft.
These six transmitters formed the original 1974 service:
- CKGN-TV Channel 6 from Paris (serving Hamilton and Brantford)
- CKGN-TV-1 Channel 22 from Cottam (near Windsor; also serving Detroit, Michigan)
- CKGN-TV-2 Channel 2 from Bancroft (serving Belleville)
- CKGN-TV-6 Channel 6 from Gatineau, Quebec (Camp Fortune site, near Ottawa)
- CKGN-TV-22 Channel 22 from Uxbridge (near Toronto; the most powerful transmitter in Canada at the time)
- CKGN-TV-29 Channel 29 from Oil Springs (near Sarnia)
The Cottam transmitter was frequently blank during the airing of prime-time American imports as the signal reached into Detroit; Windsor is reckoned as part of the Detroit market for purposes of programming rights. This also affected CBC's station in Windsor, CBET, which frequently had to air alternative programs. For more information on this, see Media in Windsor, Ontario and Media in Detroit.
In 1986, the CRTC approved the relocation of the Windsor-area transmitter from Cottam to Stevenson. This transmitter (then CIII-TV-1) was silent for several years following a transmitter fire in the late 1970s. Some time after this, the CIII-TV-22 call letters from the now-disused Uxbridge transmitter were re-assigned to the Stevenson transmitter. The transmitter is located southwest of Wheatley, between Wheatley and Leamington, but its signal is aimed northeast (towards Chatham–Kent), and barely reaches Windsor and Detroit—presumably to protect the Detroit stations.
CIII-TV-22 (the transmitter in Uxbridge) had an effective radiated power of 5 MW, making it Canada's most-powerful transmitter.
The Uxbridge transmitter was eliminated in 1988, replaced by CIII-TV-41, broadcasting from the CN Tower in Toronto. For all intents and purposes, given that the station is based in Toronto, this was CIII's main transmitter and Global's flagship even before the station officially moved its licence to Toronto in 2009. This was the case with the Uxbridge transmitter as well. Starting in 2008, CIII began sending its signal to the Toronto transmitter first, since the Paris transmitter did not yet have digital capability.
Other transmitters were gradually introduced, including (launch dates in parenthesis):
- CIII-TV-7 Channel 7 from Midland (November 1987, serving Barrie)
- CIII-TV-4 Channel 4 from Owen Sound (June 1988)
- CIII-TV-27 Channel 27 from Peterborough (October 1988)
- CFGC-TV Channel 11 from Sudbury (December 1992)
- CFGC-TV-2 Channel 2 from North Bay (December 1992)
- CIII-TV-13 Channel 13 from Timmins (December 1992)
- CIII-TV-12 Channel 12 from Sault Ste. Marie (December 1992)
- CIII-TV-55 Channel 55 from Fort Erie (early 1993, serving Niagara Falls and the southern Niagara Region; signal also reaches Buffalo, New York)
CIII is not available in Thunder Bay, but Thunder Bay Television station CHFD broadcasts a large amount of Global programming and uses the Global branding. TBTV's owners, the Dougall family, were concerned about Global threatening their local television monopoly (DougallMedia controls all local network television output for the Thunder Bay region and had previously lobbied the CRTC to cease CHCH-TV's cable transmissions in the mid-1990s) and pressured the CRTC to deny Global's application to build a transmitter there. However, in 2009, Thunder Bay Television switched the affiliation of CHFD from CTV to Global. As a result, Global programming is available in Thunder Bay, just not via CIII-TV's province-wide network of repeaters. Similarly, in Kenora, the Shaw-owned former CTV affiliate, CJBN-TV, switched to full-time Global programming in late 2011.
Initial attempts to cover Peterborough and Kingston from the Bancroft transmitter had yielded poor to marginal results; this signal has since been largely supplanted (for Peterborough only) by the more-powerful CIII-TV-27.
Global's CIII-TV-41 Toronto, along with CHCH Hamilton and Global BC began over-the-air high-definition broadcasts in 2008.
In the early 1990s, additional transmitters were added to expand Global's footprint in Ontario.
Read more about this topic: CIII-DT