I live almost directly west of you in northern Etobicoke and am able to get all of the available stations with my indoor antenna. Now mind you, some of them are definitely tougher to get than others but for me ABC is one of the easier Buffalo stations to get as I guess you have heard from others.

When trying to tune into ABC HD have you been checking your signal strengh meter? If so, are you getting any signal at all? I think if you are getting a weak signal showing up that a preamp would help but if you aren't getting any signal at all then you must not have a clear shot in the direction that the signal is coming from. I found that with my internal antenna my signal strength can go from 0 bars to 8 bars by just moving the antenna a few feet in right direction.

I hope this helps.