When I had Shaw Home Phone installed a few months ago, the installer asked me if I had any signal issues. Although i had very minor ghosting on one tv on one channel that I didn't ever watch, I told him about it and he installed an amplifier. Didn't cost me anything.
Maybe give them a call and see what they say. I think that my dad had an amplifier installed by shaw for free once too.
Edit: Funny that the box is worse than straight analogue through the wall though. On my digital box, I found that the analogue channels were clearer on the box than if I plugged straight into the wall. I assumed that there was some built-in amplifying that the box did.
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