Okay, in this subject I'll try to list the most important and powerful radio networks and stations broadcasting from Buenos Aires City and the most powerful stations from the Buenos Aires Province. It doesn't pretends to be highly complete, since that would be impossible due to the myriad of entirely local stations every city and partido has. I hope it's being informative to anyone who might be interested on Buenos Aires radio
AM (all stations are from Buenos Aires City unless specified)
530 Radio de las Madres (talk/cultural)
550 Radio Colonia (news/sports/variety) [from Colonia del Sacramento, Uruguay]
570 Radio Argentina (brokered/Hot AC)
590 Radio Continental (news/sports)
610 Radio General San Martín (brokered/tango) [from San Martín Partido, Buenos Aires Province]
630 Radio Rivadavia (news/sports)
650 Radio Repórter Belgrano (brokered/tango)
660 Radio Amplitud (brokered/Italian songs) [from La Matanza Partido]
670 Radio República (brokered/tango) [from La Matanza Partido]
680 Radio Magna (brokered/oldies) [from San Martín Partido]
690 K24 en Radio (sports/tango)
710 Radio Diez (news/talk)
730 Radio General Güemes (sports/variety)
750 AM750 (talk/eclectic)
770 Radio Cooperativa (news/talk)
790 Radio Mitre (news/sports)
810 Radio La Gauchita (folk)
830 Radio del Pueblo (brokered/oldies)
840 Radio General Belgrano (sports/tango)
850 La Voz de América (Paraguayan songs) [from José C. Paz Partido]
870 Radio Nacional de Buenos Aires (public radio, National Government)
890 Radio Libre (lotteries/brokered) [from La Matanza Partido]
910 Radio La Red (news/sports)
950 Radio Nueve (sports)
980 AM980 (folk) [from José C. Paz Partido]
990 Radio Splendid (brokered/tango)
1030 Radio del Plata (news/sports)
1050 Radio Concepto (talk/eclectic)
1070 Radio El Mundo (business)
1090 Radio Décadas (oldies)
1110 Radio de la Ciudad de Buenos Aires (public radio, Buenos Aires City Government)
1150 Radio Sagrada Familia (Catholic) [from La Matanza Partido]
1170 La Radio de mi País (folk) [from Malvinas Argentinas Partido]
1190 Radio América (news/talk)
1220 Radio Cadena Eco (brokered/sports)
1240 Radio Cadena Uno (brokered/Lite AC)
1270 Radio de la Provincia de Buenos Aires (public radio, Buenos Aires Province Government) [from La Plata, capital of the Buenos Aires Province]
1350 Radio Buenos Aires (talk/Lite AC)
1370 La 13 70 (folk)
1450 Radio El Sol (Lite AC)
1530 Radio Eco Porteña (news/sports)
FM (all stations are from Buenos Aires City unless specified)
89.1 Radio Touché (rock/reggae) [from San Isidro Partido]
92.7 La 2X4 (public tango radio, Buenos Aires City Government)
93.7 RPN Rock y Pop Nacional (public rock, National Government)
94.3 Radio Disney (CHR)
94.7 Radio Palermo (brokered)
95.1 Radio Metro (talk/dance)
95.9 Rock and Pop (talk/rock)
96.7 Radio Nacional de Música Clásica (public classical, National Government)
97.5 Vale 97.5 (Lite AC)
97.9 Radio Cultura (culture/classical)
98.3 Mega 98.3 (rock)
98.7 Radio Nacional de Música Folclórica (public folk, National Government)
99.1 Cadena 3 (news/talk)
99.5 FM Federal (public Lite AC, Buenos Aires City's Police Force)
99.9 La Cien (CHR)
100.3 Radio Cultura Musical (classical)
100.7 Blue FM (Hot AC)
101.1 Radio Latina (talk/Latin) [from La Matanza Partido]
101.5 Pop 101.5 (talk/variety)
101.9 KSK FM (dance)
102.3 Aspen Classic (Hot AC)
103.1 Radio Vorterix (rock)
103.7 Radio TKM (CHR)
104.3 FM Imagina (Lite AC)
105.5 Los 40 Principales (CHR)
106.3 Red Aleluya (Christian)
106.7 FM Millenium (easy listening)
107.9 ESPN Radio (sports/Hot AC)
The radio dial, specially on FM, is without doubts absolutely crowded. However I didn't list any local station here, so it might not be so noticeable I hope this have served as a glimpse for anyone who might wonder what you can hear in Buenos Aires
AM (all stations are from Buenos Aires City unless specified)
530 Radio de las Madres (talk/cultural)
550 Radio Colonia (news/sports/variety) [from Colonia del Sacramento, Uruguay]
570 Radio Argentina (brokered/Hot AC)
590 Radio Continental (news/sports)
610 Radio General San Martín (brokered/tango) [from San Martín Partido, Buenos Aires Province]
630 Radio Rivadavia (news/sports)
650 Radio Repórter Belgrano (brokered/tango)
660 Radio Amplitud (brokered/Italian songs) [from La Matanza Partido]
670 Radio República (brokered/tango) [from La Matanza Partido]
680 Radio Magna (brokered/oldies) [from San Martín Partido]
690 K24 en Radio (sports/tango)
710 Radio Diez (news/talk)
730 Radio General Güemes (sports/variety)
750 AM750 (talk/eclectic)
770 Radio Cooperativa (news/talk)
790 Radio Mitre (news/sports)
810 Radio La Gauchita (folk)
830 Radio del Pueblo (brokered/oldies)
840 Radio General Belgrano (sports/tango)
850 La Voz de América (Paraguayan songs) [from José C. Paz Partido]
870 Radio Nacional de Buenos Aires (public radio, National Government)
890 Radio Libre (lotteries/brokered) [from La Matanza Partido]
910 Radio La Red (news/sports)
950 Radio Nueve (sports)
980 AM980 (folk) [from José C. Paz Partido]
990 Radio Splendid (brokered/tango)
1030 Radio del Plata (news/sports)
1050 Radio Concepto (talk/eclectic)
1070 Radio El Mundo (business)
1090 Radio Décadas (oldies)
1110 Radio de la Ciudad de Buenos Aires (public radio, Buenos Aires City Government)
1150 Radio Sagrada Familia (Catholic) [from La Matanza Partido]
1170 La Radio de mi País (folk) [from Malvinas Argentinas Partido]
1190 Radio América (news/talk)
1220 Radio Cadena Eco (brokered/sports)
1240 Radio Cadena Uno (brokered/Lite AC)
1270 Radio de la Provincia de Buenos Aires (public radio, Buenos Aires Province Government) [from La Plata, capital of the Buenos Aires Province]
1350 Radio Buenos Aires (talk/Lite AC)
1370 La 13 70 (folk)
1450 Radio El Sol (Lite AC)
1530 Radio Eco Porteña (news/sports)
FM (all stations are from Buenos Aires City unless specified)
89.1 Radio Touché (rock/reggae) [from San Isidro Partido]
92.7 La 2X4 (public tango radio, Buenos Aires City Government)
93.7 RPN Rock y Pop Nacional (public rock, National Government)
94.3 Radio Disney (CHR)
94.7 Radio Palermo (brokered)
95.1 Radio Metro (talk/dance)
95.9 Rock and Pop (talk/rock)
96.7 Radio Nacional de Música Clásica (public classical, National Government)
97.5 Vale 97.5 (Lite AC)
97.9 Radio Cultura (culture/classical)
98.3 Mega 98.3 (rock)
98.7 Radio Nacional de Música Folclórica (public folk, National Government)
99.1 Cadena 3 (news/talk)
99.5 FM Federal (public Lite AC, Buenos Aires City's Police Force)
99.9 La Cien (CHR)
100.3 Radio Cultura Musical (classical)
100.7 Blue FM (Hot AC)
101.1 Radio Latina (talk/Latin) [from La Matanza Partido]
101.5 Pop 101.5 (talk/variety)
101.9 KSK FM (dance)
102.3 Aspen Classic (Hot AC)
103.1 Radio Vorterix (rock)
103.7 Radio TKM (CHR)
104.3 FM Imagina (Lite AC)
105.5 Los 40 Principales (CHR)
106.3 Red Aleluya (Christian)
106.7 FM Millenium (easy listening)
107.9 ESPN Radio (sports/Hot AC)
The radio dial, specially on FM, is without doubts absolutely crowded. However I didn't list any local station here, so it might not be so noticeable I hope this have served as a glimpse for anyone who might wonder what you can hear in Buenos Aires