You are the proud owner of a Channel Master Quantum 1111: one of the best VHF-only antennas ever made. It, and it's bigger brother, the Quantum 1110, were my very favorite VHF antennas EVER, and was angry when Channel Master discontinued the Quantum series for the cheaper, and less effective Crossfire series.
Unfortunately for you, the Quantum 1111 is not a UHF antenna, and all of the Vancouver digital stations are on UHF. I would suggest that you keep the Quantum 1111, and add an AntennasDirect XG-91 UHF antenna on a 4' mast above the VHF antenna, and connect the two antennas to the CM Titan 7777 preamplifier. The Titan 7777 makes this pretty easy, because it has separate VHF and UHF inputs on it. You will, however, need to open the Titan 7777's case, change the input control switch to SEPARATE, and then connect the two antennas according to their correct inputs. Once that's done, you'll see the Vancouver digital stations without a problem at all...
You mentioned the Channel Master 4228, and it will work, but presents quite a face to the wind, and the AntennasDirect is really a better antenna since Channel Master redesigned the 4228. The AntennasDirect XG-91 also ships a LOT more easily than does the 4228.
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