Traditional Irish Music
For the Dayton radio area, the Celtic radio broadcast is on 91.3FM WYSO, "The Dear Green Place". Its web page is http://wyso.org/programs/dear-green-place Cindy Funk is the DJ, and does a fine job of it. The show "Detours" is on ahead of it, and Norm Whitman sometimes plays some Irish-American tunes towards the end as a lead-in.
Tony, I didn't know if you had these so I posted only in the comments section. You can select which stations, if any, you want to post elsewhere.
Fordham University check "programs" for celtic
Shamrock Trad Irish Music Society list of stations
Boston area and I am sure there are many more
Here's a list both sides of the pond. http://tunein.com/radio/Irish-g149/
Check your time zone/air time differences.
Celtic Sunday Brunch: Sundays from 11am-1pm US ET (GMT -4) on WDVR (89.7FM; http://wdvrfm.org)
Come West Along The Road, a traditional Irish music radio show which airs every Sunday at noon EST on WTMR-800 on the am dial in Philadelphia. It also streams on the internet at www.wtmrradio.com. I feature music of Ireland, Scotland and Cape Breton, live performances, phone interviews and trad news of concerts, festivals, events, etc. This program is hosted by Tradconnect member, Marianne MacDonald.
Also, Vince Gallagher's Irish Hour airs on the same radio channel from 11:00 Am to 12:00Pm.
Thistle and Shamrock on National Public Radio check here for times for US states
This is another list of international folk stations. Listeners can select Irish, Scottish, Celtic, folk etc. and bookmark favorites. Check for time zone differences and whether music streams over the internet. Enjoy.
In Charlottesville, Virginia, you can hear ATLANTIC WEEKLY PART TWO programme on-line and also on the FM dial every Saturday from 10 am till 12 noon, eastern US time, or 3 to 5 pm in Ireland that day. On the web the station is found at www.WTJU.net. Presenters are Kevin Donleavy, Cinder Stanton, Mark Rough, and Joe Basconi. Queries to email@example.com, who is a TradConnect member.
Hi, I know I am not in the USA. My show Celtic Serenade has been going on for the last 39 years in Nova Scotia Canada. You can get to it by going to www.capebretonradio.com/cjcb
Thursday evening - the Down Jersey Radio Program on WVLT 92.1 FM Vineland N.J. from 9:00-10:00pm EST USA throughout the Delaware Valley including all of Southern New Jersey. Philadelphia and parts of Eastern Pa. Wilmington and parts of Northern Delaware and parts of Eastern Maryland and streamed live on the internet at www.wvlt.com Jim Albertson mysite.verizon.net/downjerseyjim
WFUV, 90.7 FM, is Fordham University's FM radio station. It has traditional Irish music on weekends, particularly every Sunday afternoon. You may access it online at http://www.wfuv.org/listen
Celtic Connections (http://www.celticconnectionsradio.org/) is syndicated on many stations in the States.