Clear-channel station
kHz Callsign City of license kW Transmitter coordinates
640 KYUK Bethel 10 60°46′54″N 161°53′08″W / 60.78175°N 161.885639°W / 60.78175 ; -161.885639 ( KYUK 640 - 10 kW )
650 KENI Anchorage 50 61°09′58″N 149°49′34″W / 61.166111°N 149.826111°W / 61.166111 ; -149.826111 ( KENI 650 - 50 kW )
660 KFAR Fairbanks 10 64°48′29″N 147°29′34″W / 64.808056°N 147.492778°W / 64.808056 ; -147.492778 ( KFAR 660 - 10 kW )
670 KDLG Dillingham 10 59°02′43″N 158°27′07″W / 59.045278°N 158.451944°W / 59.045278 ; -158.451944 ( KDLG 670 - 10 kW )
680 KBRW Barrow 10 71°15′24″N 156°31′32″W / 71.256667°N 156.525556°W / 71.256667 ; -156.525556 ( KBRW 680 - 10 kW )
700 KBYR Anchorage 10 61°12′25″N 149°55′20″W / 61.206944°N 149.922222°W / 61.206944 ; -149.922222 ( KBYR 700 - 10 kW )
720 KOTZ Kotzebue 10 66°50′22″N 162°34′05″W / 66.839444°N 162.568056°W / 66.839444 ; -162.568056 ( KOTZ 720 - 10 kW )
750 KFQD Anchorage 50 61°20′18″N 150°02′03″W / 61.338333°N 150.034167°W / 61.338333 ; -150.034167 ( KFQD 750 - 10 kW )
770 KCHU Valdez 9.7 61°06′40″N 146°15′39″W / 61.111111°N 146.260833°W / 61.111111 ; -146.260833 ( KCHU 770 - 9.7 kW )
780 KNOM Nome 25 / 14 64°29′16″N 165°17′58″W / 64.487778°N 165.299444°W / 64.487778 ; -165.299444 ( KNOM 780 - 25 / 14 kW )
820 KCBF Fairbanks 10 64°52′44″N 147°40′06″W / 64.878889°N 147.668333°W / 64.878889 ; -147.668333 ( KCBF 820 - 10 kW )
850 KICY Nome 50 64°29′15″N 165°18′53″W / 64.4875°N 165.314722°W / 64.4875 ; -165.314722 ( KICY 850 - 50 kW )
890 KBBI Homer 10 59°40′14″N 151°26′38″W / 59.670556°N 151.443889°W / 59.670556 ; -151.443889 ( KBBI 890 - 10 kW )
1020 KVNT Eagle River 10 61°29′02″N 149°45′44″W / 61.483889°N 149.762222°W / 61.483889 ; -149.762222 ( KVNT 1020 - 10 kW )
1080 KOAN Anchorage 10 61°07′12″N 149°53′43″W / 61.12°N 149.895278°W / 61.12 ; -149.895278 ( KOAN 1080 - 10 kW )
1170 KJNP North Pole 50 / 21 64°45′34″N 147°19′26″W / 64.759444°N 147.323889°W / 64.759444 ; -147.323889 ( KJNP 1170 - 50 / 21 kW )
List of all clear-channel stations
The following two tables show all of the class-A stations in North America . First is the Canada , Mexico , and contiguous United States table , for the former class I-A and class I-B stations . General Order 40 allocations are in bold . Second is the Alaska table , for the former class I-N stations . Under the most recent treaty , Mexican Class A stations which previously operated with 50 kW or less ( but a minimum of 10 kW nights ) may increase power to 100 kW days while retaining their 10 kW night operation . This created some anomalies where stations licensed for 10 kW during all hours could increase power to 100 kW days and 10 kW nights , unless a directional antenna system was installed for nights , in which case the maximum night power was 50 kW . Additionally , one Class B station which had been operating non-directionally with 100 kW days and 50 kW nights was required to reduce power to 50 kW during all hours . Class A ( former I-A/I-B ) stations kHz Callsign City of license kW Transmitter coordinates 540 CBK Watrous , Saskatchewan 50 51°40′48″N 105°26′48″W﻿ / ﻿51.68°N 105.446667°W﻿ / 51.68 ; -105.446667﻿ ( CBK 540 - 50 kW ) 540 CBT Grand Falls , Newfoundland and Labrador 10 48°57′03″N 55°37′34″W﻿ / ﻿48.950833°N 55.626111°W﻿ / 48.950833 ; -55.626111﻿ ( CBT 540 - 10 kW ) 540 XEWA San Luis Potosí , San Luis Potosí 150 22°09′29″N 100°55′35″W﻿ / ﻿22.157944°N 100.92625°W﻿ / 22.157944 ; -100.92625﻿ ( XEWA 540 - 150 kW ) 640 CBN St. John 's , Newfoundland and Labrador 10 47°34′08″N 52°48′45″W﻿ / ﻿47.568889°N 52.8125°W﻿ / 47.568889 ; -52.8125﻿ ( CBN 640 - 10 kW ) 640 KFI Los Angeles , California 50 33°52′47″N 118°00′47″W﻿ / ﻿33.879722°N 118.013056°W﻿ / 33.879722 ; -118.013056﻿ ( KFI 640 - 50 kW ) 650 WSM Nashville , Tennessee 50 35°59′53″N 86°47′27″W﻿ / ﻿35.998194°N 86.790833°W﻿ / 35.998194 ; -86.790833﻿ ( WSM 650 - 50 kW ) 660 WFAN New York , New York 50 40°51′35″N 73°47′07″W﻿ / ﻿40.859722°N 73.785278°W﻿ / 40.859722 ; -73.785278﻿ ( WFAN 660 - 50 kW ) 670 WSCR Chicago , Illinois 50 41°56′03″N 88°04′24″W﻿ / ﻿41.934167°N 88.073333°W﻿ / 41.934167 ; -88.073333﻿ ( WSCR 670 - 50 kW ) 680 KNBR San Francisco , California 50 37°32′50″N 122°14′00″W﻿ / ﻿37.547222°N 122.233333°W﻿ / 37.547222 ; -122.233333﻿ ( KNBR 680 - 50 kW ) 690 CKGM Montreal , Quebec 50 45°17′43″N 73°43′18″W﻿ / ﻿45.2953°N 73.7217°W﻿ / 45.2953 ; -73.7217﻿ ( CKGM 690 - 50 kW ) 690 XEWW Tijuana , Baja California 77.5 / 50 32°17′52″N 117°01′48″W﻿ / ﻿32.297778°N 117.03°W﻿ / 32.297778 ; -117.03﻿ ( XEWW 690 - 77.5 / 50 kW ) 700 WLW Cincinnati , Ohio 50 39°21′11″N 84°19′30″W﻿ / ﻿39.353056°N 84.325°W﻿ / 39.353056 ; -84.325﻿ ( WLW 700 - 50 kW ) 710 KIRO Seattle , Washington 50 47°23′55″N 122°26′00″W﻿ / ﻿47.398611°N 122.433333°W﻿ / 47.398611 ; -122.433333﻿ ( KIRO 710 - 50 kW ) 710 WOR New York , New York 50 40°47′51″N 74°05′24″W﻿ / ﻿40.7975°N 74.09°W﻿ / 40.7975 ; -74.09﻿ ( WOR 710 - 50 kW ) 720 WGN Chicago , Illinois 50 42°00′42″N 88°02′07″W﻿ / ﻿42.011667°N 88.035278°W﻿ / 42.011667 ; -88.035278﻿ ( WGN 720 - 50 kW ) 730 CKAC Montreal , Quebec 50 45°30′50″N 73°58′24″W﻿ / ﻿45.5139°N 73.9733°W﻿ / 45.5139 ; -73.9733﻿ ( CKAC 730 - 50 kW ) 730 XEX Mexico City , D.F . 60 / 100 19°21′54″N 98°57′28″W﻿ / ﻿19.36505°N 98.957703°W﻿ / 19.36505 ; -98.957703﻿ ( XEX 730 - 60 / 100 kW ) 740 CFZM Toronto , Ontario 50 43°34′30″N 79°49′02″W﻿ / ﻿43.575°N 79.817222°W﻿ / 43.575 ; -79.817222﻿ ( CFZM 740 - 50 kW ) 750 WSB Atlanta , Georgia 50 33°50′38″N 84°15′12″W﻿ / ﻿33.843889°N 84.253333°W﻿ / 33.843889 ; -84.253333﻿ ( WSB 750 - 50 kW ) 760 WJR Detroit , Michigan 50 42°10′05″N 83°12′54″W﻿ / ﻿42.168056°N 83.215°W﻿ / 42.168056 ; -83.215﻿ ( WJR 760 - 50 kW ) 770 WABC New York , New York 50 40°52′50″N 74°04′10″W﻿ / ﻿40.880556°N 74.069444°W﻿ / 40.880556 ; -74.069444﻿ ( WABC 770 - 50 kW ) 780 WBBM Chicago , Illinois 35 / 42 41°59′26″N 88°01′40″W﻿ / ﻿41.990556°N 88.027778°W﻿ / 41.990556 ; -88.027778﻿ ( WBBM 780 - 50 kW ) 800 XEROK Ciudad Juárez , Chihuahua 50 31°41′44″N 106°23′01″W﻿ / ﻿31.695556°N 106.383611°W﻿ / 31.695556 ; -106.383611﻿ ( XEROK 800 - 50 kW ) 810 KGO San Francisco , California 50 37°31′35″N 122°06′02″W﻿ / ﻿37.526389°N 122.100556°W﻿ / 37.526389 ; -122.100556﻿ ( KGO 810 - 50 kW ) 810 WGY Schenectady , New York 50 42°47′32″N 74°00′43″W﻿ / ﻿42.792336°N 74.011937°W﻿ / 42.792336 ; -74.011937﻿ ( WGY 810 - 50 kW ) 820 WBAP Fort Worth , Texas 50 32°36′38″N 97°10′04″W﻿ / ﻿32.610556°N 97.167778°W﻿ / 32.610556 ; -97.167778﻿ ( WBAP 820 - 50 kW ) 830 WCCO Minneapolis , Minnesota 50 45°10′44″N 93°20′59″W﻿ / ﻿45.178889°N 93.349722°W﻿ / 45.178889 ; -93.349722﻿ ( WCCO 830 - 50 kW ) 840 WHAS Louisville , Kentucky 50 38°15′40″N 85°25′43″W﻿ / ﻿38.261111°N 85.428611°W﻿ / 38.261111 ; -85.428611﻿ ( WHAS 840 - 50 kW ) 850 KOA Denver , Colorado 50 39°30′22″N 104°45′57″W﻿ / ﻿39.506111°N 104.765833°W﻿ / 39.506111 ; -104.765833﻿ ( KOA 850 - 50 kW ) 860 CJBC Toronto , Ontario 50 43°34′30″N 79°49′03″W﻿ / ﻿43.575°N 79.8175°W﻿ / 43.575 ; -79.8175﻿ ( CJBC 860 - 50 kW ) 870 WWL New Orleans , Louisiana 50 29°50′14″N 90°07′55″W﻿ / ﻿29.837222°N 90.131944°W﻿ / 29.837222 ; -90.131944﻿ ( WWL 870 - 50 kW ) 880 WCBS New York , New York 50 40°51′35″N 73°47′08″W﻿ / ﻿40.859806°N 73.785444°W﻿ / 40.859806 ; -73.785444﻿ ( WCBS 880 - 50 kW ) 890 WLS Chicago , Illinois 50 41°33′21″N 87°50′54″W﻿ / ﻿41.555833°N 87.848333°W﻿ / 41.555833 ; -87.848333﻿ ( WLS 890 - 50 kW ) 900 CKBI Prince Albert , Saskatchewan 10 53°12′03″N 105°45′14″W﻿ / ﻿53.2008°N 105.7538°W﻿ / 53.2008 ; -105.7538﻿ ( CKBI 900 - 10 kW ) 900 XEW Mexico City , D.F . 100 19°21′54″N 98°57′28″W﻿ / ﻿19.36505°N 98.957703°W﻿ / 19.36505 ; -98.957703﻿ ( XEW 900 - 100 kW ) 940 CFNV Montreal , Quebec 50 45°23′34″N 73°41′53″W﻿ / ﻿45.3928°N 73.6981°W﻿ / 45.3928 ; -73.6981﻿ ( CFNV 940 - 50 kW ) 940 XEQ Mexico City , D.F . 30 19°21′37″N 98°59′32″W﻿ / ﻿19.360217°N 98.992194°W﻿ / 19.360217 ; -98.992194﻿ ( XEQ 940 - 30 kW ) 990 CBW Winnipeg , Manitoba 50 / 46 49°50′10″N 97°30′46″W﻿ / ﻿49.836111°N 97.512778°W﻿ / 49.836111 ; -97.512778﻿ ( CBW 990 - 50 / 46 kW ) 990 CBY Corner Brook , Newfoundland and Labrador 10 48°55′58″N 57°54′22″W﻿ / ﻿48.9328°N 57.9061°W﻿ / 48.9328 ; -57.9061﻿ ( CBY 990 - 10 kW ) 1000 KOMO Seattle , Washington 50 47°27′49″N 122°26′27″W﻿ / ﻿47.463611°N 122.440833°W﻿ / 47.463611 ; -122.440833﻿ ( KOMO 1000 - 50 kW ) 1000 WMVP Chicago , Illinois 50 41°49′05″N 87°59′18″W﻿ / ﻿41.818056°N 87.988333°W﻿ / 41.818056 ; -87.988333﻿ ( WMVP 1000 - 50 kW ) 1000 XEOY Mexico City , D.F . 50 / 10 19°23′18″N 99°07′29″W﻿ / ﻿19.388333°N 99.124722°W﻿ / 19.388333 ; -99.124722﻿ ( XEOY 1000 - 50 / 10 kW ) 1010 CBR Calgary , Alberta 50 50°56′17″N 113°57′42″W﻿ / ﻿50.938056°N 113.961667°W﻿ / 50.938056 ; -113.961667﻿ ( CBR 1010 - 50 kW ) 1010 CFRB Toronto , Ontario 50 43°30′40″N 79°37′48″W﻿ / ﻿43.511019°N 79.630019°W﻿ / 43.511019 ; -79.630019﻿ ( CFRB 1010 - 50 kW ) 1020 KDKA Pittsburgh , Pennsylvania 50 40°33′34″N 79°57′10″W﻿ / ﻿40.559481°N 79.95266°W﻿ / 40.559481 ; -79.95266﻿ ( KDKA 1020 - 50 kW ) 1030 WBZ Boston , Massachusetts 50 42°16′44″N 70°52′34″W﻿ / ﻿42.278889°N 70.876111°W﻿ / 42.278889 ; -70.876111﻿ ( WBZ 1030 - 50 kW ) 1040 WHO Des Moines , Iowa 50 41°39′10″N 93°21′01″W﻿ / ﻿41.652778°N 93.350278°W﻿ / 41.652778 ; -93.350278﻿ ( WHO 1040 - 50 kW ) 1050 XEG Monterrey , Nuevo León 150 25°41′53″N 100°10′30″W﻿ / ﻿25.698056°N 100.175°W﻿ / 25.698056 ; -100.175﻿ ( XEG 1050 - 150 kW ) 1060 KYW Philadelphia , Pennsylvania 50 40°06′12″N 75°14′56″W﻿ / ﻿40.103333°N 75.248889°W﻿ / 40.103333 ; -75.248889﻿ ( KYW 1060 - 50 kW ) 1060 XEEP Mexico City , D.F . 100 / 20 19°21′50″N 99°01′38″W﻿ / ﻿19.363972°N 99.027194°W﻿ / 19.363972 ; -99.027194﻿ ( XEEP 1060 - 100 / 20 kW ) 1070 KNX Los Angeles , California 50 33°51′35″N 118°20′59″W﻿ / ﻿33.859722°N 118.349722°W﻿ / 33.859722 ; -118.349722﻿ ( KNX 1070 - 50 kW ) 1080 KRLD Dallas , Texas 50 32°53′25″N 96°38′44″W﻿ / ﻿32.890281°N 96.645561°W﻿ / 32.890281 ; -96.645561﻿ ( KRLD 1080 - 50 kW ) 1080 WTIC Hartford , Connecticut 50 41°46′39″N 72°48′19″W﻿ / ﻿41.7775°N 72.805278°W﻿ / 41.7775 ; -72.805278﻿ ( WTIC 1080 - 50 kW ) 1090 KAAY Little Rock , Arkansas 50 34°36′00″N 92°13′30″W﻿ / ﻿34.6°N 92.225°W﻿ / 34.6 ; -92.225﻿ ( KAAY 1090 - 50 kW ) 1090 WBAL Baltimore , Maryland 50 39°22′33″N 76°46′21″W﻿ / ﻿39.375833°N 76.7725°W﻿ / 39.375833 ; -76.7725﻿ ( WBAL 1090 - 50 kW ) 1090 XEPRS Rancho del Mar , Rosarito , Baja California 50 32°24′08″N 117°05′12″W﻿ / ﻿32.402278°N 117.086722°W﻿ / 32.402278 ; -117.086722﻿ ( XEPRS 1090 - 50 kW ) 1100 WTAM Cleveland , Ohio 50 41°16′50″N 81°37′22″W﻿ / ﻿41.280556°N 81.622778°W﻿ / 41.280556 ; -81.622778﻿ ( WTAM 1100 - 50 kW ) 1110 KFAB Omaha , Nebraska 50 41°07′11″N 96°00′06″W﻿ / ﻿41.119722°N 96.001667°W﻿ / 41.119722 ; -96.001667﻿ ( KFAB 1110 - 50 kW ) 1110 WBT Charlotte , North Carolina 50 35°07′56″N 80°53′23″W﻿ / ﻿35.132222°N 80.889722°W﻿ / 35.132222 ; -80.889722﻿ ( WBT 1110 - 50 kW ) 1120 KMOX St. Louis , Missouri 50 38°43′22″N 90°03′19″W﻿ / ﻿38.722778°N 90.055278°W﻿ / 38.722778 ; -90.055278﻿ ( KMOX 1120 - 50 kW ) 1130 CKWX Vancouver , British Columbia 50 49°09′27″N 123°04′01″W﻿ / ﻿49.157601°N 123.067024°W﻿ / 49.157601 ; -123.067024﻿ ( CKWX 1130 - 50 kW ) 1130 KWKH Shreveport , Louisiana 50 32°42′18″N 93°52′55″W﻿ / ﻿32.705°N 93.881944°W﻿ / 32.705 ; -93.881944﻿ ( KWKH 1130 - 50 kW ) 1130 WBBR New York , New York 50 40°48′39″N 74°02′24″W﻿ / ﻿40.810833°N 74.04°W﻿ / 40.810833 ; -74.04﻿ ( WBBR 1130 - 50 kW ) 1140 WRVA Richmond , Virginia 50 37°24′13″N 77°18′59″W﻿ / ﻿37.403611°N 77.316389°W﻿ / 37.403611 ; -77.316389﻿ ( WRVA 1140 - 50 kW ) 1140 XEMR Monterrey , Nuevo León 50 25°45′52″N 100°15′11″W﻿ / ﻿25.764444°N 100.253056°W﻿ / 25.764444 ; -100.253056﻿ ( XEMR 1140 - 50 kW ) 1160 KSL Salt Lake City , Utah 50 40°46′48″N 112°05′51″W﻿ / ﻿40.78°N 112.0975°W﻿ / 40.78 ; -112.0975﻿ ( KSL 1160 - 50 kW ) 1170 KFAQ Tulsa , Oklahoma 50 36°08′49″N 95°48′27″W﻿ / ﻿36.146944°N 95.8075°W﻿ / 36.146944 ; -95.8075﻿ ( KFAQ 1170 - 50 kW ) 1170 WWVA Wheeling , West Virginia 50 40°06′07″N 80°52′02″W﻿ / ﻿40.101944°N 80.867222°W﻿ / 40.101944 ; -80.867222﻿ ( WWVA 1170 - 50 kW ) 1180 WHAM Rochester , New York 50 43°04′55″N 77°43′30″W﻿ / ﻿43.081944°N 77.725°W﻿ / 43.081944 ; -77.725﻿ ( WHAM 1180 - 50 kW ) 1190 KEX Portland , Oregon 50 45°25′20″N 122°33′57″W﻿ / ﻿45.422222°N 122.565833°W﻿ / 45.422222 ; -122.565833﻿ ( KEX 1190 - 50 kW ) 1190 XEWK Guadalajara , Jalisco 50 / 10 20°44′11″N 103°20′52″W﻿ / ﻿20.736389°N 103.347778°W﻿ / 20.736389 ; -103.347778﻿ ( XEWK 1190 - 50 / 10 kW ) 1200 WOAI San Antonio , Texas 50 29°30′08″N 98°07′44″W﻿ / ﻿29.502111°N 98.128806°W﻿ / 29.502111 ; -98.128806﻿ ( WOAI 1200 - 50 kW ) 1210 WPHT Philadelphia , Pennsylvania 50 39°58′46″N 74°59′13″W﻿ / ﻿39.979444°N 74.986944°W﻿ / 39.979444 ; -74.986944﻿ ( WPHT 1210 - 50 kW ) 1220 XEB Mexico City , D.F . 100 19°18′31″N 99°03′32″W﻿ / ﻿19.308611°N 99.058889°W﻿ / 19.308611 ; -99.058889﻿ ( XEB 1220 - 100 kW ) 1500 KSTP Saint Paul , Minnesota 50 45°01′32″N 93°03′06″W﻿ / ﻿45.025556°N 93.051667°W﻿ / 45.025556 ; -93.051667﻿ ( KSTP 1500 - 50 kW ) 1500 WFED Washington , D.C. 50 39°02′31″N 77°02′47″W﻿ / ﻿39.041944°N 77.046389°W﻿ / 39.041944 ; -77.046389﻿ ( WFED 1500 - 50 kW ) 1510 WLAC Nashville , Tennessee 50 36°16′19″N 86°45′28″W﻿ / ﻿36.271944°N 86.757778°W﻿ / 36.271944 ; -86.757778﻿ ( WLAC 1510 - 50 kW ) 1520 KOKC Oklahoma City , Oklahoma 50 35°20′00″N 97°30′16″W﻿ / ﻿35.333333°N 97.504444°W﻿ / 35.333333 ; -97.504444﻿ ( KOKC 1520 - 50 kW ) 1520 WWKB Buffalo , New York 50 42°46′10″N 78°50′34″W﻿ / ﻿42.769444°N 78.842778°W﻿ / 42.769444 ; -78.842778﻿ ( WWKB 1520 - 50 kW ) 1530 KFBK Sacramento , California 50 38°50′54″N 121°28′58″W﻿ / ﻿38.848333°N 121.482778°W﻿ / 38.848333 ; -121.482778﻿ ( KFBK 1530 - 50 kW ) 1530 WCKY Cincinnati , Ohio 50 39°03′55″N 84°36′27″W﻿ / ﻿39.065278°N 84.6075°W﻿ / 39.065278 ; -84.6075﻿ ( WCKY 1530 - 50 kW ) 1540 KXEL Waterloo , Iowa 50 42°10′48″N 92°18′38″W﻿ / ﻿42.18°N 92.310556°W﻿ / 42.18 ; -92.310556﻿ ( KXEL 1540 - 50 kW ) 1540 ZNS-1 Nassau , Bahamas 50 25°00′14″N 77°21′01″W﻿ / ﻿25.003917°N 77.350333°W﻿ / 25.003917 ; -77.350333﻿ ( ZNS-1 1540 - 50 kW ) 1550 CBEF Windsor , Ontario 10 42°12′56″N 82°55′15″W﻿ / ﻿42.2156°N 82.9208°W﻿ / 42.2156 ; -82.9208﻿ ( CBEF 1550 - 10 kW ) 1560 KNZR Bakersfield , California 25 / 10 35°18′30″N 119°02′46″W﻿ / ﻿35.308333°N 119.046111°W﻿ / 35.308333 ; -119.046111﻿ ( KNZR 1560 - 25 / 10 kW ) 1560 WFME New York , New York 50 40°43′00″N 73°55′04″W﻿ / ﻿40.716667°N 73.917778°W﻿ / 40.716667 ; -73.917778﻿ ( WFME 1560 - 50 kW ) 1570 XERF Ciudad Acuña , Coahuila 100 29°21′00″N 101°02′00″W﻿ / ﻿29.35°N 101.033333°W﻿ / 29.35 ; -101.033333﻿ ( XERF 1570 - 100 kW ) 1580 CKDO Oshawa , Ontario 10 43°52′19″N 78°45′53″W﻿ / ﻿43.871944°N 78.764722°W﻿ / 43.871944 ; -78.764722﻿ ( CKDO 1580 - 10 kW )
A clear-channel station is an AM radio station in North America that has the highest protection from interference from other stations, particularly concerning night-time skywave propagation. The system exists to ensure the viability of cross-country or cross-continent radio service, and is enforced through a series of treaties and statutory laws. Now known as Class A stations since 1982, they are occasionally still referred to by their former classifications of Class I-A (the highest classification), Class I-B (the next highest class), or Class I-N (for stations in Alaska too far away to cause interference to the primary clear-channel stations in the lower 48 states). The term clear-channel is used most often in the context of North America and the Caribbean, where the concept originated. Since 1941, these stations have been required to maintain at least 10,000 watts of power to retain their status. Nearly all these stations in the United States, Canada and The Bahamas broadcast at 50,000 watts, with several clear-channel stations in Mexico going as high as 150,000 watts and XEW in Mexico City operating at 250,000 watts for over 80 years. (Cuba was originally included in the plan and had several stations given clear-channel status, but Cuba stopped participating after the Cuban Revolution of 1959.)