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You are getting fewer channels with the amp plugged in because it is likely overloading (distorting) from your very strong local transmissions. Any amplifier used in your location, if one is even needed, would need to very resistant to overloading or inter-modulation distortion.
An omni-directional antenna rarely works well with digital signals. Typically, reception in difficult locations will be adversely affected due to the omni's lack of directionality (inability to resist multi-path signals).
As far as Toronto is concerned, you will need to make a choice as to whether to select an antenna for post-transition digital only (which must include high-VHF(CFTO) in addition to UHF) or if you want to include current analog reception which includes low-VHF.
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