WFAN

660 AM WFAN is a 50,000-watt Sports station in New York, New York.  They were the first to ever adopt a full-time Sports format and are currently the flagship station for the New York Yankees, New York Giants and Brooklyn Nets.  Another WFAN sticker can be seen here.
 

WCBC

107.1 FM WCBC (W Cumberland Broadcasting Corporation) is a Classic Hits station licensed to Keyser, West Virginia.
 

KRJT

A random (1990) Broadcasting Yearbook lists 1410 AM KRJT as having a Country format.  The Wikipedia page for the current station at that frequency says the call letters existed there from 1988 to 2000.  KRJT was licensed to Bowie, Texas.
 

KGSR / Austin City Limits Radio

 

Austin, Texas' 107.1 FM frequency was home to KGSR from 1989 until 2009, many of those years as an Adult Album Alternative station.  The KGSR call letters then moved to 93.3 FM where they are currently known as "Lucy 93.3" with a Hot AC format.

 

The Adult Album Alternative format is now heard on KGSR's HD2 sub-channel branded as "Austin City Limits Radio," named after the long-running public television music show.  They are also heard on translator K246BD at 97.1 FM.

KCJB

A 1992 window sticker from 910 AM KCJB, a Classic Country station in Minot, North Dakota.
 

CFOU

89.1 FM CFOU broadcasts from the Trois-Rivières campus of the University of Quebec.  The French-language station went on the air in September 1997.
 

WUBG

"Big 105.3" was a 60s and 70s Oldies station heard in the northern suburbs of Boston, Massachusetts circa 2018.  They were heard on 1570 AM WUBG as well as translator W287CW at 105.3 FM.  Both are now part of the K-LOVE network of Contemporary Christian stations and are licensed to Methuen, MA.
 

WPKL

WPKL "Pickle 99.3" plays Classic Hits in Uniontown, Pennsylvania south of Pittsburgh.  Pittsburgh is the headquarters of the H.J. Heinz Company.  Is that why WPKL is known as "The Pickle"?
 

WMAQ

670 AM WMAQ was on the air in Chicago, Illinois from 1922 until 2000.  The top two stickers probably date to when they had a Country format which started getting phased out by the mid-1980s.  WMAQ was the flagship station of the Chicago White Sox throughout the 1970s and 80s.  In 2000 they flipped to a full-time Sports station as WSCR "670 The Score."

 

WHNC

890 WHNC began broadcasting on June 6, 1945 in (W) Hendersonville, North Carolina.  They are currently off the air because of some FCC rules violations regarding their public inspection file and problems with their Emergency Alert System.
 

WDMT

WDMT aired an Adult Album Alternative format in Wilkes-Barre, Pennsylvania.  In 2013 "The Mountain" moved from 102.3 FM to the HD2 sub-channel of WKRZ and later to WGGY's sub-channel.
 

WAOY

91.7 FM WAOY is a Religious station in Gulfport, Mississippi.  They are one of more than 180 stations in the American Family Radio network.
 

KTLW

920 AM KTLW was on the air in Houston, Texas from 1948 until 1980, the last two decades as a Top-40 station.
 

KPDA

100.7 KPDA "La Poderosa" is a Regional Mexican station in Boise, Idaho.
 

KLIR

"Clear 101" KLIR is an Adult Contemporary station in Columbus, Nebraska.
 

KEXX

"My 103.9" KEXX was a Hot Adult Contemporary station in Phoenix, Arizona circa 2012.
 

CKNU? CHXX?

"Rock 100.9" was licensed to Donnacona, Quebec near Quebec City.  It's unclear whether they had the call letters CKNU or CHXX when this sticker was printed.  Leave a comment if you know.
 

K277BL

"Power 103.3" was a CHR station in Corpus Christi, Texas.  K277BL is a translator for 107.7 KOUL and currently carries a Tejano format.
 

WYPR

88.1 FM WYPR (We're Your Public Radio) is the main National Public Radio affiliate in Baltimore, Maryland. 
 

WRQR

WRQR was a Rock station in Wilmington, North Carolina from 1996 until 2008.