That web site is focused on analogue-era UHF-band TV in the U.S.A. with rare mentions of the many Canadian UHF-band channels that were receivable along the nort

That web site is focused on analogue-era UHF-band TV in the U.S.A. with rare mentions of the many Canadian UHF-band channels that were receivable along the northern border back then. I immediately looked for any channel 37 assignments and found just one, which was assigned but never used. 37 was intentionally kept clear by international convention as a safe band for radio astronomy.