There’s a guy selling them on eBay. Actually he will sell you a mic flag with the call letters of your choice, but we are proud that he has chosen to feature WLHA instead of any of the usual suspects like NBC, CBS, or WLS. Seen here is the flag for the RCA 77D series, models of which are owned by several of us on the WLHA staff. He also makes flags for other models of classic microphones so if you are in the market check him out.