The terrain between you and the Calgary transmitters makes it tough for digital TV reception in your area, but your noise margin figures are still in positive numbers, so reception is still possible.
You didn't mention the presence of a preamplifier, nor did you mention how many TV sets you are running from your antenna, but if you are not using a preamplifier, adding one is likely to help you. If you are using multiple TV sets, a preamplifier is guaranteed to help you!
You may want to look at the AntennasDirect PA-19, which has plenty of gain, and has a very low noise floor. Other good choices would be a Winegard AP-8275 or an AntennaCraft 10G202. I would change out your antenna only if a preamplifier doesn't help you.
it seems odd that you can see 21.1 (CBC Calgary) which, on paper, has a much weaker signal at your location than the Global station.
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