I thought it would be interesting to put together a list of historical US SWBC assignments in the 43 meter band, so I extracted them from
https://www.fcc.gov/general/high-frequency-stations-seasonal-operating-frequency-schedulesData is from 2004, and they are broken up by season. They still have not updated to reflect WRMI moving from 6915 to 6885.
WRMI claims to be broadcasting on 6915 (now 6885) to zone 10, which is Mexico.
There is a poor quality map of the target zones here, which I have included in this post :
http://www.ecfr.gov/graphics/er13my03.047.gif
;Freq. Start Stop Call Pow Azm Target Zones Days Stdate Spdate
;-----------------------------------------------------------------------------------------
6855 0300 0600 WYFR 100 355 4,5,9 1234567 280304 311004
6890 2200 0500 WWRB 50 90 27,28,37-39 1234567 040404 311004
6890 2300 0600 WWRB 50 90 27,28,37-39 1234567 280304 040404
6855 0300 0900 WYFR 100 355 4,5,9 1234567 311004 270305
6855 0900 1300 WYFR 100 355 4,5,9 1234567 311004 270305
6870 0000 1300 WRMI 50 317 2,3 1234567 311004 270305
6870 1300 1600 WRMI 50 160 10-13 1234567 311004 270305
6890 0900 1300 WYFR 100 355 4,5,9 1234567 311004 270305
6890 2300 0600 WWRB 65 90 27,28,37-39 1234567 311004 270305
6855 0300 1200 WYFR 100 355 4,5,9 1234567 270305 301005
6855 0300 0900 WYFR 100 355 4,5,9 1234567 301005 260306
6855 0900 1300 WYFR 100 355 4,5,9 1234567 301005 260306
6855 1945 2245 WYFR 100 44 28 1234567 301005 260306
6875 0000 0500 WEWN 500 285 10 1234567 301005 260306
6875 0000 0500 WEWN 500 20 4,5,9 1234567 301005 260306
6890 0900 1300 WYFR 100 355 4,5,9 1234567 301005 260306
6890 2300 0500 WWRB 100 45 4,5,9 1234567 301005 260306
6855 0300 0500 WYFR 100 355 4,5,9 1234567 260306 291006
6855 0500 1200 WYFR 100 355 4,5,9 1234567 260306 291006
6890 2300 0500 WWRB 100 45 4,5,9 1234567 260306 291006
6855 0300 0900 WYFR 100 355 4,5,9 1234567 291006 250307
6855 0900 1300 WYFR 100 355 4,5,9 1234567 291006 250307
6855 1945 2245 WYFR 100 44 27 1234567 291006 250307
6890 0900 1300 WYFR 100 355 4,5,9 1234567 291006 250307
6890 1300 1400 KNLS 100 300 34,35,44 1234567 291006 250307
6890 2200 0500 WWRB 100 45 4,5,9 1234567 291006 250307
6915 1200 1300 KNLS 100 270 34,35,45 1234567 291006 250307
6915 1600 1700 KNLS 100 300 33,34,35,44 1234567 291006 250307
6915 1700 1800 KNLS 100 300 33,34,35,44 1234567 291006 250307
6855 0300 1200 WYFR 100 355 4,5,9 1234567 250307 281007
6890 1000 1100 KNLS 100 285 33,34,35,45 1234567 250307 281007
6890 1200 1500 WWRB 100 340 2-4 1234567 250307 281007
6890 2200 0500 WWRB 100 45 4,5,9 1234567 250307 281007
6855 0300 1300 WYFR 100 355 4,5,9 1234567 281007 300308
6855 1945 2245 WYFR 100 44 27 1234567 281007 300308
6890 0900 1300 WYFR 100 355 4,5,9 1234567 281007 300308
6890 1200 1500 WWRB 100 340 2-4 1234567 281007 300308
6890 1300 1400 KNLS 100 300 34,35,44 1234567 281007 300308
6890 2200 0500 WWRB 100 45 4,5,9 1234567 281007 300308
6915 1200 1300 KNLS 100 270 34,35,44 1234567 281007 300308
6915 1600 1700 KNLS 100 285 33,34,35,44 1234567 281007 300308
6915 1700 1800 KNLS 100 285 33,34,35,44 1234567 281007 300308
6890 1000 1100 KNLS 100 285 33,34,35,45 1234567 300308 261008
6890 1200 1500 WWRB 100 340 2-4 1234567 300308 261008
6890 2200 0500 WWRB 100 45 4,5,9 1234567 300308 261008
6915 0300 1200 WYFR 100 355 4,5,9 1234567 300308 261008
6985 2245 0445 WYFR 100 355 4,5,9 1234567 300308 261008
6890 0900 1300 WYFR 100 355 4,5,9 1234567 261008 290309
6890 1300 1400 KNLS 100 300 34,35,44 1234567 261008 290309
6890 2200 0400 WWRB 100 45 4,5,9 1234567 261008 011108
6890 2200 0400 WWRB 100 45 4,5,9 1234567 080309 290309
6890 2300 0500 WWRB 100 45 4,5,9 1234567 021108 070309
6915 0300 1200 WYFR 100 355 4,5,9 1234567 261008 290309
6915 1200 1300 KNLS 100 270 34,35,44 1234567 261008 290309
6915 1600 1700 KNLS 100 285 33,34,35,44 1234567 261008 290309
6915 1700 1800 KNLS 100 285 33,34,35,44 1234567 261008 290309
6915 1945 2200 WYFR 100 44 27 1234567 261008 290309
6890 1000 1100 KNLS 100 285 33,34,35,45 1234567 290309 251009
6890 2200 0400 WWRB 100 45 4,5,9 1234567 290309 251009
6915 0300 1200 WYFR 100 355 4,5,9 1234567 290309 251009
6915 2100 0100 WYFR 100 160 16 1234567 290309 090409
6985 2245 0445 WYFR 100 355 4,5,9 1234567 290309 251009
6875 0300 1200 WYFR 100 355 4,5,9 1234567 251009 280310
6890 0100 0500 WYFR 100 222 11 1234567 251009 280310
6890 0900 1300 WYFR 100 355 4,5,9 1234567 251009 280310
6890 1300 1400 KNLS 100 300 34,35,44 1234567 251009 280310
6890 1400 1500 KNLS 100 270 34,35,45 1234567 251009 280310
6890 1500 1600 KNLS 100 300 24,26,35 1234567 251009 280310
6890 1600 1700 KNLS 100 315 24,26,35 1234567 251009 280310
6890 1700 1800 KNLS 101 315 24,26,35 1234567 251009 280310
6915 0300 1200 WYFR 100 355 4,5,9 1234567 251009 280310
6915 1200 1300 KNLS 100 270 34,35,44 1234567 251009 280310
6915 1600 1700 KNLS 100 300 33,34,35,44 1234567 251009 280310
6915 1700 1800 KNLS 100 300 33,34,35,44 1234567 251009 280310
6915 1800 2200 WYFR 100 44 27 1234567 251009 280310
6875 0300 0500 WYFR 50 181 11 1234567 280310 311010
6875 0500 1200 WYFR 100 315 2 1234567 280310 311010
6890 0500 0900 WEWN 250 40 27,28 1234567 280310 311010
6915 2100 0100 WYFR 100 160 16 1234567 280310 311010
6985 2245 0445 WYFR 100 355 4,5,9 1234567 280310 311010
6875 0300 1200 WYFR 100 285 10 1234567 311010 270311
6890 0100 0500 WYFR 100 222 11 1234567 311010 270311
6890 0900 1300 WYFR 100 355 4,5,9 1234567 311010 270311
6915 1800 2200 WYFR 100 44 27 1234567 311010 270311
6875 0300 0500 WYFR 50 181 11 1234567 270311 301011
6875 0500 1200 WYFR 100 315 2 1234567 270311 301011
6915 2100 0100 WYFR 100 160 16 1234567 270311 301011
6985 2245 0445 WYFR 100 355 4,5,9 1234567 270311 301011
6875 0300 0700 WYFR 100 285 10 1234567 301011 250312
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 110312 250312
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 110312 250312
6875 2200 0100 WWCR 100 46 4,9,27,37-39 1234567 301011 061111
6875 2300 0200 WWCR 100 46 4,9,27,37-39 1234567 071111 100312
6890 0100 0400 WYFR 100 222 11 1234567 301011 250312
6890 0400 0500 WYFR 100 222 11 1234567 301011 250312
6875 0300 0345 WYFR 100 181 11 1234567 250312 281012
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 250312 310512
6875 2000 0200 WWCR 100 46 4,9,27,37-39 1234567 010612 310812
6875 2000 0200 WWCR 100 46 4,9,27,37-39 1234567 010912 281012
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 250312 310512
6915 2245 0100 WYFR 100 160 16 1234567 250312 281012
6875 0200 0400 WYFR 100 285 10 1234567 281012 310313
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 281012 031112
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 100313 310313
6875 1000 1200 WWCR 100 46 4,9,27,37-39 1234567 041112 090313
6875 2000 2200 WWCR 100 46 4,9,27,37-39 1234567 281012 031112
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 100313 310313
6875 2100 2300 WWCR 100 46 4,9,27,37-39 1234567 041112 090313
6875 0200 0400 WYFR 100 285 10 1234567 310313 271013
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 310313 310513
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 010913 271013
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 010613 310813
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 010913 271013
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 310313 310513
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 010613 310813
6875 0200 0600 WYFR 100 285 10 1234567 271013 300314
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 090314 300314
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 271013 021113
6875 1000 1200 WWCR 100 46 4,9,27,37-39 1234567 031113 080314
6875 2000 0100 WWCR 100 46 4,9,27,37-39 1234567 271013 021113
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 031113 080314
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 090314 300314
6875 0200 0600 WYFR 100 285 10 1234567 300314 261014
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 010614 310814
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 010914 261014
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 300314 310514
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 261014 011114
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 080315 290315
6875 1000 1200 WWCR 100 46 4,9,27,37-39 1234567 021114 070315
6875 2000 0100 WWCR 100 46 4,9,27,37-39 1234567 261014 011114
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 021114 070315
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 080315 290315
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 010915 251015
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 010615 310815
6875 2100 0100 WWCR 100 46 4,9,27,37-39 1234567 290315 310515
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 130316 270316
6875 0900 1100 WWCR 100 46 4,9,27,37-39 1234567 251015 311015
6875 1000 1200 WWCR 100 46 4,9,27,37-39 1234567 011115 120316
6875 2000 0100 WWCR 100 46 4,9,27,37-39 1234567 251015 311015
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 130316 270316
6875 2100 0200 WWCR 100 46 4,9,27,37-39 1234567 011115 120316
;----+----+----+------------------------------+---+----+-------+---+---+-------+------+------+-+-----+----------+---+---+---+-----+-+-----+-----+-----+-------
;FREQ STRT STOP CIRAF ZONES LOC POWR AZIMUTH SLW ANT DAYS FDATE TDATE MOD AFRQ LANGUAGE ADM BRC FMO REQ# OLD ALT1 ALT2 ALT3 NOTES
;----+----+----+------------------------------+---+----+-------+---+---+-------+------+------+-+-----+----------+---+---+---+-----+-+-----+-----+-----+-------
6875 0900 1100 4,9,27,37-39 WCR 100 46 0 902 1234567 251015 311015 D Eng USA WCR FCC 1673
6875 0900 1100 4,9,27,37-39 WCR 100 46 0 902 1234567 130316 270316 D Eng USA WCR FCC 1672
6875 1000 1200 4,9,27,37-39 WCR 100 46 0 902 1234567 011115 120316 D Eng USA WCR FCC 1674
6875 2000 0100 4,9,27,37-39 WCR 100 46 0 902 1234567 251015 311015 D Eng USA WCR FCC 1675
6875 2100 0200 4,9,27,37-39 WCR 100 46 0 902 1234567 130316 270316 D Eng USA WCR FCC 1676
6875 2100 0200 4,9,27,37-39 WCR 100 46 0 902 1234567 011115 120316 D Eng USA WCR FCC 1677
6915 0000 2400 10 YFR 100 285 0 805 1234567 170216 270316 D 11925 Eng USA RMI FCC 18028
6875 2100 0100 4,9,27,37-39 WCR 100 46 0 902 1234567 270316 310516 D Eng USA WCR FCC 1601
6875 2100 0100 4,9,27,37-39 WCR 100 46 0 902 1234567 010916 301016 D Eng USA WCR FCC 1602
6875 2100 0200 4,9,27,37-39 WCR 100 46 0 902 1234567 010616 310816 D Eng USA WCR FCC 1600
6915 0000 2400 10 YFR 100 285 0 805 1234567 270316 301016 D 11925 Eng USA RMI FCC 15056