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After wading through those regulations, here are what I believe to be the salient points.
You are allowed up to 1 watt of power per 6 Mhz of bandwidth for a fixed station, with a 6dbi antenna. If your antenna has more gain, you must reduce the power of your signal.
You are allowed up to 100 milliwatts of power for a portable/personal station.
I believe the basic difference between the 2 types is the capability of a fixed station to determine it’s geographic location to within 50 meters, and have access to a database of available TV stations from that location (so it won’t generate interference).
Next, I’m going to see if Canada has equivalent rules.