With all of the
VHF television licences in Toronto taken, Znaimer and a partnership applied for and were awarded the city's first
UHF commercial broadcasting licence, on channel 79.
Citytv launched in 1972, and changed frequency to channel 57 in 1983. With Citytv, he gradually began to pioneer a distinctive style of broadcasting, inspired in part by
Marshall McLuhan, which emphasized a strongly local, hip and casual format aimed at young audiences. In 1981, Toronto-based media conglomerate
CHUM Limited purchased Citytv, and Znaimer became vice-president of CHUM and executive producer for all of City's programming. By 1984 Znaimer's vision of a 24-hour music video station was realized with the creation of
MuchMusic. Much like City, MuchMusic emphasized the liveness and spontaneity of television, relying largely on hand-held cameras, and impromptu shots of VJs taken just about anywhere in the CHUM-City offices.
MusiquePlus, a joint venture based in Montreal and catering to the French-speaking audiences of Canada, was launched in 1986. In 1987 CHUM-City purchased a former publishing building in Toronto's downtown west end and renovated it into the
CHUM-City Building, a landmark media centre. Throughout the 1990s, Znaimer presided over a considerable expansion of the CHUM-City television empire.
Bravo! was launched as a new style arts channel in 1995, and
Space in 1997. He continued his original vision for television with the launching of Canada's first 24-hour local news station,
CablePulse 24 in 1998. Further cable channels included
Canadian Learning Television,
Star!,
Drive-In Classics,
FashionTelevisionChannel,
BookTelevision,
CourtTV Canada,
SexTV: The Channel,
MuchLOUD and
MuchVibe. Znaimer also oversaw the launch of
Citytv Vancouver. Znaimer left Citytv and CHUM Limited in April 2003, but stayed on in certain production roles. He co-founded and for a time served as chairman of
Cannasat Therapeutics, a publicly traded company pioneering a new class of drugs from marijuana; he continues as a shareholder and advisor to the company. Ultimately, CHUM Limited was acquired in 2007 by
CTVglobemedia and the Citytv stations (including CITY and CKVU) are now owned by
Rogers Media. ==ZoomerMedia==