heres a few helpful links: (post more if you have em)
TSRN (Texas Sports Radio Network): look to the left of the page and the featured games are in sub-catagories i.e. Houston area, East Texas, etc.
http://www.tsrnsports.com/default.html
Radio-Locator.com: just punch in your zipcode, and look for local stations that might carry your game.
http://www.radio-locator.com/