"in Detroit there are, and have been for over 10 years, 3 full time heavy metal/hard rock stations." And they would be?
Here's a listing of every radio station in Detroit:
AM 540 - CBEF - International
AM 560 - WRDT - Religious
AM 580 - CKWW - Gold/Easy Listening
AM 680 - WNZK - Ethnic/Talk
AM 690 - WNZK- Ethnic/Talk
AM 760 - WJR - News / Talk
AM 800 - CJKW - Windsor News & Talk
AM 950 - WWJ - News
AM 990 - WDEO - Religious
AM 1030 - WUFL - Religious
AM 1050 - WTKA - Sports
AM 1090 - WCAR - Religious
AM 1130 - WDFN - Sports
AM 1200 - WCHB - Talk/Religious
AM 1270 - WXYT - Talk/Sports
AM 1310 - WDTW - Talk
AM 1340 - WEXL - Gospel Music
AM 1400 - WDTK - News/Talk
AM 1440 - WMKM - Religious
AM 1460 - WPON - Oldies
AM 1500 - WLQV - Religious
AM 1550 - CBC - CBC Radio One, Windsor Public Radio
AM 1600 - WAAM - Ann Arbor Talk
FM 88.1 - WHPR - Urban Contemporary
FM 88.1 - WBFH - Bloomfield Hills Schools
FM 88.1 - WSDP - Plymouth High School
FM 88.3 - WSHJ - Southfield High School
FM 88.3 - WXOU - Oakland University
FM 88.3 - WCBN - Univ. of Michigan
FM 88.7 - CIMX - Modern Rock: 89X
FM 89.1 - WPHS - Warren Consolidated Schools
FM 89.1 - WEMU - Jazz / Blues / NPR
FM 89.1 - WGTE - NPR
FM 89.3 - WHFR - Henry Ford Community College
FM 89.3 - WBLD - West Bloomfield Schools
FM 89.5 - WOVI - Novi High School
FM 89.5 - WAHS - Auburn Hills - High School
FM 89.5 - W208BB - Religious
FM 89.9 - CBE - CBC Radio Two, Windsor Public Radio
FM 90.9 - WRCJ - Classical & Jazz
FM 91.5 - CJAM - Univ. of Windsor
FM 91.7 - WUOM - Ann Arbor Public Radio / NPR
FM 92.3 - WMXD - Classic Soul/R&B
FM 93.1 - WDRQ - Variety Hits: Doug FM
FM 93.5 - WHMI - News, Classic Hits
FM 93.9 - CIDR - Adult Album Alternative: The River
FM 94.7 - WCSX - Classic Rock
FM 95.5 - WKQI - Contemporary Hits/Top 40: Channel 955
FM 96.3 - WDVD - Hot Adult Contemporary
FM 97.1 - WKRK - Talk: Free FM
FM 97.5 - WYDM - Hot Adult Contemporary
FM 97.9 - WJLB - Urban: Hip Hop/R&B
FM 98.7 - WVMV - Smooth Jazz
FM 99.5 - WYCD - Country
FM 100.3 - WNIC - Adult Contemporary
FM 101.1 - WRIF - Active Rock
FM 101.9 - WDET - Detroit Public Radio/NPR
FM 102.7 - WHDT - Urban/Hip Hop
FM 102.9 - WWWW- Country
FM 103.5 - WMUZ - Christian Contemporary
FM 104.3 - WOMC - Oldies
FM 105.1 - WMGC - Adult Contemporary
FM 105.9 - WDMK - Adult Urban Contemporary: Kiss FM
FM 106.7 - WDTW - Country: The Fox
FM 107.1 - WQKL - Adult Alternative: 107one
FM 107.5 - WGPR - Soft Urban/Jazz
I don't see heavy metal listed in there. But wait, look, four jazz stations! Hooray for Detroit!