Tester wrote:
Are the call letters KCBS the only example of their kind? KCBS is an
Infinity (CBS/Viacom) all newser on 740 kHz in San Francisco. KCB S-FM
(formerly KNX-FM) and KCBS-TV (formerly KNXT) are in Los Angeles.

No.

For example, KSAS-FM on 103.3 in the Boise, Idaho area while KSAS-TV is
in Wichita, Kansas. Or KTRS(AM) in St. Louis while KTRS-FM is in
Casper, Wyoming. I'm sure there are others.

I do think KCBS was the first, when the FCC decided to allow a given
company to reuse "base calls" on co-owned stations in different services
in different areas.

Later, the rules were amended to allow reuse by *any* station (even
those not commonly-owned) provided they had the consent of whoever held
the calls first.

Today, I'm not sure they even need consent - it may just be a matter of
"try it if you think you won't get sued"...

--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com