Well, I have searched the web as well, but couldn't find any definitive / clear ruling.
I am no where near a heritage neighborhood (old town Québec City). I am in a residential neighborhood just outside of Québec proper, in a town called Boischatel. I've inquired with the urbain planner and they sent me documentation, which reads in part:
> 1° une antenne accessoire installée au sol doit respecter les dispositions suivantes: la hauteur ne doit pas excéder 5 mètres dans le cas d’une antenne parabolique installée au sol, et 10 mètres pour les autres types d’antenne, calculée à partir du sol ; ce dernier type d’antenne ne doit pas être soutenu par des haubans ;
Which translates roughly to: non-parabolic antennas are limited to 10m in height (30 ft) and cannot use guylines, as mesured from ground level.
30 ft seems a bit low to me. I live in a 2 story house (house is about 4' above ground, plus 2 stories and floor 16' + 1' and roof: +- 12' at the apex for total of about 33'). The tower wouldn't even clear the house.
David