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I don't know how reliable that Canadian towers site is, it shows seemingly ridiculous number of towers in some suburban blocks?

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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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