Re: "who else is allocated to broadcast on 18.1 uhf ?"

TVO in London

Re: "why are some canadian stations so damn cheap with their signals"

Because they are owned by companies that are deeply invested in subscription television. CHCH is owned by Channel Zero which operates a bunch of specialty channels.

Re: "american tv stations are glad to share their signals"

Because a LOT more than 3 or 4 companies are competing for viewers, many with no conflict of interest with cable/satelitte.

It all makes sense from a corporate point of view. It sucks from a viewer point of view. Guess whose side the CRTC and Industry Canada is on??