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Re:Mobile LTE Coverage Map by bhc on Tuesday September 28, 2021 @11:27PM (#28689988)
It's based ISED's bimonthly CSV data dump of licensed radio transmitters. Heavy concentration of cellular antennas in some blocks might be because ISED's database lists even nano/picocells.

http://sms-sgs.ic.gc.ca/eic/site/sms-sgs-prod.nsf/eng/h_0001...

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