I'm in the same area, I live in the towers beside Lougheed Mall, ground elevation is 185ft but I'm on the 11th floor facing south and west.
So far I've just tried an old RCA UHF amplified loop antenna
and I can pick up KBCB easily. I'm using the tuner in my Acer AT3705 LCD-TV, it unfortunately doesn't seem to give me a strength or even tell me what the true channel number is. KBCB is @ 23% though the channel scan, it also pauses for a long time at 44% and 47%, I think one of those is KVOS though, because once i hit a sweet spot and it displayed "35-12" in the guide, but wouldn't tune in after that.
If I stick my head outside the west window and look around, I can see Burnaby Mountain blocking my view to Seymour, but I have a pretty clear view to the south and since KBCB comes in easily I think I'll be able to pick up the new channels coming off Orcas Island when they're up.
I guess Canadian HD is out for me, unless I'm able to pick up something from Victoria when their towers are up, if they're strong enough. Even if I were line-of-sight to Seymour, would I be able to get a signal with two other condos and three concrete walls in the way?
Do you think it's worth trying a silver sensor clone? Dell.ca has the Philips amplified model for $29 free shipping ... I'm in a condo and already have a dish, so I don't want to push my luck with a big antenna, but I could probably have a sharp shooter or one of the square shooters on my balcony -- Radio Shack US site has what looks like a small version of the square shooter (DA-5200) on their site as well, but I haven't found an review of it yet. I could try a CM4228 or 4221 in a closet or something, but I'd guess that wouldn't be so effective ...
I should try my luck with analog channels, I suppose, just as a reference.