{{short description|Radio station in Orillia, Ontario}} {{Use Canadian English|date=February 2026}} {{Infobox radio station | name = CISO-FM | logo = CISO 89.1MAXfm logo.jpg | logo_size = 200px | city = Orillia, Ontario | country = CA | area = Simcoe County | branding = 89.1 Max FM | format = Modern rock | frequency = 89.1 MHz | airdate = 2011 | language = English | erp = 2.5 kW | haat = {{convert|154.1|m}} | callsign_meaning = Sunshine Orillia (former branding) | class = A | sister_stations = CHGB-FM | owner = Bayshore Broadcasting | webcast = [https://bayshore.leanplayer.com/CISOFM Listen Live] | website = [http://www.891maxfm.ca/ 891maxfm.ca] }}
'''CISO-FM''' is a Canadian radio station, which broadcasts a modern rock format at 89.1 MHz in Orillia, Ontario. The station is branded as ''89.1 Max FM''.<ref>[http://www.fybush.com/NERW/2009/090608/nerw.html#can The CRTC has completed its review of more than a dozen applications for new FM signals in Ontario's "Cottage Country".] ''Scott Fybush/North East Radio Watch'', June 8, 2009</ref>
==History== Owned by Bayshore Broadcasting, the station received CRTC approval on June 1, 2009.<ref>{{Cite web|url=https://crtc.gc.ca/eng/archive/2009/2009-318.htm|title=ARCHIVED - Licensing of new radio stations to serve Orillia, Ontario|first=Canadian Radio-television and Telecommunications Commission (CRTC)|last=Government of Canada|date=June 1, 2009|website=crtc.gc.ca}}</ref><ref>{{Cite web |url=https://sd.ic.gc.ca/pls/engdoc_anon/web_search.licensee_name_results?output_format=1&selected_columns=TX_FREQ,RX_FREQ,CALL_SIGN,LOCATION,COMPANY_NAME&col_in_fmt=COMMA_LIST&selected_column_group=NONE&extra_ascii=None&extra_xml=None&licensee_name=BAYSHORE%20BROADCASTING%20CORPORATION%20&admin_do=42&company_cd=86609208 |title=Licensee Name Search Results | Spectrum Direct | Industry Canada |access-date=2009-07-05 |archive-url=https://web.archive.org/web/20110706182728/https://sd.ic.gc.ca/pls/engdoc_anon/web_search.licensee_name_results?output_format=1&selected_columns=TX_FREQ,RX_FREQ,CALL_SIGN,LOCATION,COMPANY_NAME&col_in_fmt=COMMA_LIST&selected_column_group=NONE&extra_ascii=None&extra_xml=None&licensee_name=BAYSHORE%20BROADCASTING%20CORPORATION%20&admin_do=42&company_cd=86609208 |archive-date=2011-07-06 |url-status=dead }}</ref>
The station officially launched in February 2011 with an adult contemporary format branded as ''Sunshine 89.1''.
On November 1, 2018, CISO-FM rebranded to ''89.1 Max FM'' with a classic hits format playing the best of the 70's, 80's and 90's.
On May 17, 2019, the station changed its format to modern rock but retained its "Max FM" branding.
==References== {{reflist}}
==External links== * [https://broadcasting-history.ca/radio/radio-stations/ontario/ontario-central/CISO-FM CISO-FM] at The History of Canadian Broadcasting by the Canadian Communications Foundation * {{RecnetCanada|CISO-FM}}
{{Simcoe County, Ontario Radio}}
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{{DEFAULTSORT:Ciso-Fm}} Category:Radio stations in Simcoe County Category:Orillia Iso Category:Radio stations established in 2009 Category:2009 establishments in Ontario
{{Ontario-radio-station-stub}}