This article appeared in the 1939 Broadcasting Yearbook. Apex stations used amplitude modulation. Many evolved into FM stations.

High Frequency (Apex) Broadcast Stations in the United States

Authorized by FCC as of January 1 1939

Frequency Groups listed in Rule 1053:
Group C: 31600 35600 38600 41000 kc
Group E (selective): 41600 86500 111000 88000 120000 240000 500000

CityStateCallLicenseePowerFreq in Kc.
or groups
AkronOHW8XOYAllen T. Simmons (WADC)100C
AlpineNJW2XMNEdwin H. Armstrong40000E
AlpineNJW2XSNPaul Godley100041800
BaltimoreMDW3XEYBaltimore Radio Show (WFBR)100C
BaltimoreMDW3XESMonumental Radio Co. (WCAO)200C
BostonMAW1XKAWestinghouse E. & M. Co. (WBZ)50C
(TL: Sargents
Purchase, N. H.)
MAW1XERYankee Network500C
(TL: Paxton,
MAW1XOJYankee Network5000041200
BuffaloNYW8XHWBEN Inc.100C
CharlestonWVW8XNOCharleston Broadcasting Co. (WCHS)5026100
ChattanoogaTNW4XBWWDOD Broadcasting Corp.100C
ChicagoILW9XBSNational Broadcasting Co. (WMAQ)CP-100..
CincinnatiOHW8XNUThe Crosley Corp. (WLW)100025950
ClevelandOHW8XNTRadio Air Service Corp. (WHK)50C
DallasTXW5XDA. H. Belo Corp. (WFAA)100C
DenverCOW9XLAKLZ Broadcasting Co.100C
DetroitMIW8XWJEvening News Association (WWJ)500C
HarrisburgILW9XTASchonert Radio Service50026500
HartfordCTW1XPWWDRC Inc.100040300
Kansas CityMOW9XERMidland Broadcasting Co. (KMBC)50C
Kansas CityMOW9XACommercial Radio Equipment Co.100026450
Los AngelesCAW6XDAColumbia Broadcasting System (KNX)100C
Los AngelesCAW6XREBen S. McGlashan (KGFJ)500E
Los AngelesCAW6XKGBen S. McGlashan (KGFJ)100025950
MemphisTNW4XCAMemphis Commercial Appeal Co. (WMC)250C
MinneapolisMNW9XHWColumbia Broadcasting System (WCCO)50C
MinneapolisMNW9XTCMinnesota Broadcasting Corp. (WTCN)15026050
NashvilleTNW4XANational Life & Accident Ins. Co. (WSM)CP-1000C
New BedfordMAW1XEQE. Anthony & Sons (WNBH)100C
New YorkNYW2XDVColumbia Broadcasting System (WABC)50C
New YorkNYW2XHGNational Broadcasting Co. (WEAF)150C
New YorkNYW2XJIBamberger Broadcasting Service (WOR)10026300
New YorkNYW2XDGNational Broadcasting Co. (WJZ)15038650
NorfolkVAW3XEXWTAR Radio Corp. (WTAR)5026050
Oklahoma CityOKW5XAUWKY Radiophone Co.100C
OmahaNEW9XUYCentral States Broadcasting Co. (KOIL)100C
PhiladelphiaPAW3XIRWCAU Broadcasting Co.100C
PittsburghPAW8XKAWestinghouse E & M. Co. (KDKA)150C
RochesterNYW8XAIStromberg-Carlson Co. (WHAM)100C
South BendINW9XHSouth Bend Tribune (WSBT)10026050
SpringfieldMAW1XKBWestinghouse E & M Co. (WBZA)500C
St. LouisMOW9XPDPulitzer Publishing Co. (KSD)100C
St. LouisMOW9XOKStar Times Publishing Co. (KTOK)100C
St. PaulMNW9XUPNational Battery Broadcasting Co. (KSTP)100026150
SuperiorWIW9XJLHead of the Lakes Broadcasting Co. (WEBC)25026100
WashingtonDCW3XOJansky & Bailey100040300

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