Industry Canada exempts FM broadcasting transmitters from authorization when those transmitters meet the requirement of Broadcasting Equipment Technical Standards 1 (BETS-1). These transmitters are commonly called Low Power Announcement Radios or alternatively real estate radios.
According to BETS-1, “The maximum power output of the transmitter into its antenna, with no modulation, shall not produce a field strength level of more than 100 μV/m as measured at a distance of 30 meters, compared to the USA FCC standard of 250 uV/m at 3 meters. That might seem minuscule, but it could be said in a very crude way that Canada allows more than five times the power.
Learn more with Frequently Asked Questions on Low-Power FM Broadcasting from Industry Canada
One such operator is VankleekFM a privately owned Ultra Low Power FM transmitter located in the village of Vankleek Hill, Ontario. The owner of the service, Jean Sarrazin, maintains a license with Industry Canada to use the frequency, 88.7 as an unprotected, "local public information service" and describes the operation as follows.
As a low power station the service is exempt from most CRTC content requirements as long as it respects the CRTS's exemption order defined by the following criteria:
- Operates between 88 -107.5 MHZ,
- Field strength measurements at 30 metres must not exceed 100 uv/m
- Meets all technical requirements of Industry Canada,
- Originates all programming,
- Does not rebroadcast the programming of another (broadcast) undertaking,
- Does not broadcast religious or political programming,
- Does not broadcast the same message on more than one transmitter.
I found a bit more information at an inactive but informative site called Radio XY - English Bay - kewl, eh?