The reasoning didn’t relate to interference with other stations, but rather the commission finding the station did not meet the requirement of showing a compelling technical need for a second transmitter. The commission found that many of the complaints about poor coverage came from areas at the edge or outside of CHOU’s secondary service contour, which were never expected to receive the station well, and that local interference to AM signals is to be expected.
The application only had one opposing intervention, from CHCR, the owner of FM ethnic stations CKDG 105.1 and CKIN 106.3. That group warned that the new transmitter would cause interference to CKDG and would impact their advertising. Both those arguments were essentially ignored by the commission because the two stations are far enough in frequency to not have any interference problems and because CHOU is already a licensed station and market issues have already been dealt with.
Interesting, though, is that the CBC, which owns CBME-FM-1 at 104.7, did not intervene in this case, even though there was a big potential for interference. This could open the door to another application for 104.5, provided it only interferes with 104.7 in the eastern part of the island where people could hear CBC Radio One better on 88.5 anyway. (Such a transmitter would still have to protect Boom FM at 104.1 in St-Jean-sur-Richelieu and Espace Musique at 104.3 in Trois-Rivières.)