I sent off a new e-mail to CITYTV Engineering concerning my reception problem with their HD broadcast.

Here is their most recent reply,

The power level from our transmitter remains constant.

You may be experiencing an apparent change in signal strength due to
multipath. This occurs when the receiver receives signals from two or more
different directions and is often caused by reflections off buildings or
other structures.

Multipath can affect one channel, while not affecting others. It depends on
the location of the antenna.

The various DTV power levels are related to the power level and coverage
area of the parent analog channel. Citytv analog (57) operates at a lower
level then other Toronto UHF stations and the coverage area is substantially
less than that of CBLT channel 5.

Current power levels are for the "transition phase" we are currently in.

Power level on Citytv and other DTV channels will increase with the
cessation of analog service. The DTV channels may also change at that time
as well.

Thanks for your e-mail

Ontariocraig,

It sounds like your in a great spot!

There's a big American Elm between me and the tower. Maybe its causing signal loss. It doesn't seem to be causing any problem on the other signals. I think your right concerning Toronto 1. For me that wouldn't realy make any directional difference.