KMGI

KMGI went on the air in Seattle, Washington in 1985 with an Adult Contemporary format known as "Magic 108 FM".  This t-shirt dates to around four years later when they had transitioned to Hot AC branded as "I-107.7".  The frequency is currently Alternative Rock outlet KNDD "107.7 The End".

KYKZ

KYKZ "Kix 96" plays Country music in Lake Charles, Louisiana.

Banana FM 87.7

Banana FM 87.7 broadcasts from Wakayama, Japan. 
Known as the "kingdom of fruit", Wakayama Prefecture is famous for their mandarin oranges as well as strawberries, grapes, persimmons and apricots.  Banana cultivation for clothing and household use in Japan dates back to at least the 13th century.  The fiber from the shoots are boiled in lye to make yarn, tablecloths and kimonos. 
Another banana radio bumper sticker can be seen here.

NE-WS 89.4

NE-WS 89.4 is a "lokalradio" station based in Neuss, Germany.  They went on the air in 1990.

WXYY

"Y107.9" WXYY was a Hot Adult Contemporary station licensed to Port Royal, South Carolina from 2011 to 2014. 

WOZQ

91.9 FM WOZQ broadcasts from Smith College in Northampton, Massachusetts.  Radio at the private women's liberal arts school began in January, 1949 when a carrier current station, WCSR, went on the air.  A 21-year, radio-free gap occurred between 1956 and 1977 when a new station, WRSC, was created.  A move to FM took place around 1982 with new call letters WOZQ.

WLTN

1400 AM WLTN is an Oldies outlet in (W) LiTtletoN, New Hampshire.  The 1,000-watt station went on the air in October, 1963 and can also be heard on translator W253AY at 98.5 FM.
This vintage sticker depicts the Old Man of the Mountain, a rock formation on Cannon Mountain that looked like a profile of a face when viewed from the north.  Sadly, the Old Man collapsed to the ground in 2003, a victim of a millenium of freezing, thawing and erosion that no amount of maintenance could keep up with.

WHMH

WHMH "Rockin 101" is an Active Rock station licensed to Sauk Rapids, Minnesota.

WDDC

"New Mix 100" was an Adult Contemporary station licensed to Portage, Wisconsin.  WDDC is now branded as "Thunder 100.1" and carries a Country format.

KSCR

KSCR was the campus radio station for the University of Southern California in Los Angeles.  It began in the mid-1970s as a carrier-current station broadcasting at 1560 AM.  By 1991 their Alternative Rock programming could be heard on a low power signal at 104.7 FM as "The Underground".  The all-volunteer station switched call letters to KXSC in 2010.

KRZZ

96.3 KRZZ was an AOR/Classic Rock station in Wichita, Kansas from the mid-1980s until 2004.

KSEQ

"Q97" KSEQ is a Rhythmic Top-40 station licensed to Visalia, California.

WEBE

WEBE (said on-air as "Wee-Bee 108") is a 50,000-watt Adult Contemporary station licensed to Westport, Connecticut. 

WNRP

A magnet from WNRP (W News Radio Pensacola) licensed to Gulf Breeze, Florida.  The locally owned station went on the air in 2005 with a Classic Country format before flipping to N/T two years later.

KLAP

Klappy, the hand-for-a-head station mascot of 89.5 KLAP in Gerlach, Nevada may not be as well known as the KGB Chicken or WMMS's buzzard but it really should be.  KLAP plays all kinds of stuff including Rock, Jazz, Folk, Reggae, Cajun, Latin, Dixieland and Country--a similar music mix to the legendary KPIG who's former program director founded the KLAP.

KEEL

KEEL is a News/Talk station in Shreveport, Louisiana.  They've been on the air since June, 1922.

CIDC

"Z103.5" is a Rhythmic-leaning CHR station licensed to Orangeville, Ontario.  CIDC went on the air in 1987 playing 70s & 80s hits as "DC103.5" with 50,000 watts and an antenna located on the highest spot in southern Ontario.  The DC stood for Dufferin Communications who were the original owners.  They flipped their branding to "Hits 103.5" in the late 1990s and in 2000 changed again to "Z103.5" in imitation of New York City's "Z100" WHTZ (along with a similar logo).  CIDC targets the Greater Toronto Area despite its Orangeville, Ontario city-of-license (a good 40 or so miles away from their studios in a western part of Toronto). 

WBVR

WBVR "Beaver 96.7" plays Country music in Bowling Green, Kentucky.  They are co-owned with WVVR in nearby Hopkinsville, KY, and are the only two "beaver" branded radio stations I know of.

Radio Voce

Radio Voce began broadcasting in 1976 from Brescia, Italy and primarily airs Religious programming.  They are part of the inBlu network which provides Catholic programming to about 200 stations in Italy.

WCAL

Stickers and a magnet from "Power 92" the student-run station at California University of Pennsylvania.  Radio on campus began in 1971 with WVCS (W Voice of California State) before they switched call letters to WCAL in 2005.