In Canada, because of the vast remote areas as one moves further away from the American border, low-power and high-power translators existed very early on, for both TV and AM radio. In particular, the CBC started installing what they called LPRTs (low-power radio transmitters) in the 1950s. For example, CBL in Toronto had 15 LPRTs in Northern Ontario by 1957, in communities as far away as Dryden. Others were located in communities such as Marathon, Chapleau, and White River.
On the TV side, there were several translators on the air by 1958, although I doubt any of them were extremely low powered. CJOX/10 in Argentia, Newfoundland rebroadcast CJON/6 in St. John's; CFCL/2 in Elk Lake and CFCL/3 in Kapuskasing rebroadcast CFCL/6 in Timmins, Ontario; CKSO/3 in Elliot Lake, Ontario rebroadcast CKSO/5 in Sudbury. And in Quebec, two translators in the 70-83 band were approved but not yet on air in 1958; those were CFCM/75 in Clermont, to rebroadcast CFCM/4 in Quebec City, and CJBR/70 in Estcourt, to rebroadcast CJBR/3 in Rimouski. When CHBC in Kelowna, BC went on the air, it already had two translators at Penticton and Vernon. In 1962 CHAB/4 in Moose Jaw added a translator CHRE/9 in Regina, and around the same time CKCK/2 in Regina had started its first translator at Colgate. Throughout the 1960s the CBC added translators throughout the country, some of which rebroadcast other stations on a delayed basis since they were too far from the originating station to rebroadcast directly. By the end of the 1960s, there were quite a number of translators in Central and Northern Ontario; CKVR/3 in Barrie had low-power translators in Huntsville, Parry Sound, and Haliburton; CHEX/12 in Peterborough had them in Minden and Bancroft; CFCL in Timmins had added more translators by then; CFCH/10 in North Bay had a translator CJTK/3 (no longer broadcasting) in Temiscaming, Quebec. And the CBC French network had a number of translators in Northern Ontario rebroadcasting CBOFT from Ottawa, in communities including Timmins, Sturgeon Falls, and Sudbury.