Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:

Ever wonder what it would be like to time travel? Well, just sit back and relax in your favourite armchair, put on the headphones and enjoy the short six and a half minute trip back to 1973. Here is a collection of 23 AM broadcast band radio airchecks / ID's from 23 U.S. states as recorded at Ancaster, Ontario, Canada. Equipment used was a Realistic DX150A hooked up to a long wire antenna. Please bear in mind these recordings were made using an open mike placed in front of the speaker. For example, WTMJ Milwaukee makes an NBC colour TV announcement (blooper) and you will hear a voice in the background ask "how can that be"?

1. KKJO St. Joseph, MO 1550
2. WCFL Chicago, IL 1000
3. WWWE Cleveland, OH 1100
4. WOWO Fort Wayne, IN 1190
5. WHO Des Moines, IA 1040
6. WLAC Nashville, TN 1510
7. WWL New Orleans, LA 870
8. WBAP Ft. Worth-Dallas, TX 820
9. WSB Atlanta, GA 750
10. WBZ Boston, MA 1030
11. WHAS Louisville, KY 840
12. WWVA Wheeling, WVA 1170
13. WRVA Richmond, VA 1140
14. WCCO Minneapolis-St. Paul, MN 830
15. KAAY Little Rock, AR 1090
16. WTIC Hartford, CT 1080
17. WBAL Baltimore, MD 1090
18. WJAR Providence, RI 920
19. WVOK Birmingham, AL 690
20. KOMA Oklahoma City, OK 1520
21. WTMJ Milwaukee, WI 620
22. KSL Salt Lake City, UT 1160
23. KFAB Omaha, NE 1110