Hitradio Ö3

Hitradio Ö3 is a nationwide Contemporary Hit Music station based in Vienna, Austria.  They were launched in 1967 by ORF (Österreichischer RundFunk), Austria's national public service broadcaster.  Hitradio Ö3 is the most listened to station in the country, boasting the most reach and advertising time per day, more than all private Austrian radio stations combined.

Still More Eagles

1370 AM WABD - The call letters stood for (W) AirBorne Division in honor of the 101st Airborne Division located in Fort Campbell, Kentucky.

 "Eagle 106.7" WYAY was a Classic Country station licensed to Gainesville, Georgia near Atlanta.

 93.3 FM KAGL - El Dorado, Arkansas

"Eagle 106.5" KEGX - Richland, Washington

WPAL

730 AM WPAL was the first radio station in Charleston, South Carolina to aim their programming toward an African-American audience.  They were also indispensable during 1989's Hurricane Hugo as they were the only media outlet still operating during the storm.  Read about it here.

WLTT

106.3 WLTT was a News/Talk station licensed to Shallotte, North Carolina.

WHMP

1400 AM WHMP is a News/Talk station licensed to Northampton, Massachusetts.  They are also heard on 1240 AM WHMQ in Greenfield, MA as well as on translator 96.9 FM W245BK licensed to Amherst, MA.

WDDK

"Dock 103.9" WDDK is a combo Talk/Oldies station licensed to Greensboro, Georgia.  They are also an affiliate of the Atlanta Braves Radio Network.

KXTC

99.9 FM KXTC is a Rhythmic CHR station licensed to Thoreau, New Mexico.

KSAA

According to this article, "Casa 105" KSAA spun Top-40 out of a reconverted house on First Street in Casa Grande, Arizona.  They were on the air for a little over three years from 1979 to 1983.

La Tremendas

 560 AM WIND - Chicago, Illinois

 1010 AM KLAT - Houston, Texas

 1340 AM WKGN - Knoxville, Tennessee

1230 AM WFAY - Fayetteville, NC

Cool Whip

 "Cool 96.5" WQLL was an Oldies station licensed to Bedford, New Hampshire from 1997 until 2005.

"98.3 The Whip" WWHP played a mix of Classic Country, Americana, Blues and Bluegrass.  They were licensed to Farmer City, Illinois which is part of the Bloomington, IL radio market.  The station's creative use of a radio antenna as whip was a pretty great logo.

A Pack of KOOLs

"Kool 98" KKCL was a Classic Hits station in Lubbock, Texas.  They are now branded as "Awesome 98!"

"Kool 95.9" WKKD (Will Kane Kendall DuPage--counties in their listening area) was an Oldies station licensed to Aurora, Illinois.

"Kool 101.9" WKLU was a Classic Rock station licensed in Indianapolis, Indiana.

 "Kool 99.3" KEFH plays Classic Hits in Amarillo, Texas.

CIDR

"93.9 The River" CIDR (CI Detroit's River) is an Adult Album Alternative station licensed to Windsor, Ontario.

CIDR was an Adult Contemporary/Lite Rock station circa 2000.

WMET

95½ WMET was a Rock station in Chicago, Illinois from 1976 to 1985. 

WNCC

I'm not 100% certain but I think this t-shirt is from the radio station at Northampton Community College in Bethlehem, Pennsylvania.  The artist dated their drawing to 1988 (click it bigger) and this 2014 article says the college has had a radio club for over 30 years so the math adds up.  The station currently streams online but it's unclear whether they broadcast terrestrially or via carrier current when this shirt was new.  Anybody know?

Another WNCC existed at 950 AM in Barnesboro, Pennsylvania from 1950 until 2010.  The current terrestrial WNCC has only had those call letters since 1999.

WTRU

AM 830 WTRU is a Religious Teaching station licensed to Kernersville, North Carolina.  They are the flagship station of the Truth Network with outlets in South Carolina, Virginia, Iowa and Utah.

WPFF / WRGX

90.5 FM WPFF is a Contemporary Christian station licensed to Sturgeon Bay, Wisconsin.  In 2014, they were gobbled up by the K-LOVE network of CCM stations.  WPFF also operated a half dozen or so translators around northeast Wisconsin and parts of Michigan's upper peninsula.

106.7 FM W294AI - Marquette, Michigan

96.7 FM W244AQ - Iron Mountain, Michigan

Sister station 88.5 WRGX aired a Christian Alternative Rock format from 1998 to 2006.  They flipped to Southern Gospel/Christian Country for a time before shifting to Religious Talk/Teaching as WNLI.  They too were then eaten alive by K-LOVE in 2014.

More JACK FMs

There are dozens of current and former stations around the world playing Adult Hits and branded as "JACK FM".  Here are four of them.

WQSR - Baltimore, Maryland

CFLT - Dartmouth, Nova Scotia

WJXN - Utica/Jackson, Mississippi.  Now a Classic Country station "100.9 The Legend"

WYJK - Moundsville/Wheeling, West Virginia.  Now a unique combo of Sports and Active Rock branded as "Rocky 96.5" WRQY.

Other JACK FM stickers here.  Here.  Here.  Here.  And here.

Radio Hawaii City

Decal from a Dutch pirate radio station based in Halsteren, Netherlands.  "Illegal For All" it says at the bottom of the sticker.  I cannot find any further information on the internet about this defunct(?) station.

5EZY

5EZY "Power FM" is a hit music station based in Murray Bridge, South Australia.

WISE

1310 AM WISE is a Sports station in Asheville, North Carolina.  Programming is also simulcast on 970 AM WYSE licensed to Canton, NC.  For many years, WISE was a Top-40 outlet before they flipped to Adult Standards some time in the 1980s.